[WIP] new Profiled AOT support

Context: dotnet/runtime#71787
Context: https://dev.azure.com/dnceng/public/_artifacts/feed/7.0.100-preview.7.22377.5-nonshipping/NuGet/dotnet-pgo/overview/7.0.0-preview.7.22375.6

1. Record a `.nettrace` file:

    adb reverse tcp:9000 tcp:9001
    adb shell setprop debug.mono.profile '127.0.0.1:9000,suspend'
    dotnet-dsrouter client-server -tcps 127.0.0.1:9001 -ipcc /tmp/maui-app --verbose debug
    dotnet-trace collect --diagnostic-port /tmp/maui-app --providers Microsoft-Windows-DotNETRuntime:0x1F000080018:5 --output android.nettrace

2. Install `dotnet-pgo`:

    dotnet tool install -g dotnet-pgo --add-source https://pkgs.dev.azure.com/dnceng/public/_packaging/7.0.100-preview.7.22377.5-nonshipping/nuget/v3/index.json --version 7.0.0-preview.7.22375.6

3. Convert to `.mibc`:

    dotnet-pgo create-mibc --trace android.nettrace  --output android.mibc --reference "src/profiled-aot/obj/android/obj/Release/net7.0-android/android-arm64/linked/shrunk/*.dll"

To test this, I made a `dotnet new android` app and added:

    <PropertyGroup>
      <AndroidUseDefaultAotProfile>false</AndroidUseDefaultAotProfile>
    </PropertyGroup>
    <ItemGroup>
      <AndroidMibcProfile Include="android.mibc" />
    </ItemGroup>

~~ Open Questions ~~

1. If you have to use a weird feed for `dotnet-pgo` is that OK? Are we
   not recommending users record their own profiles yet?

2. How do we make an MSBuild target to make recording profiles easier?
   I have not been able to programmatically control `dotnet-trace` in
   a nice way.

For example:

    $ dotnet build -t:BuildAndStartTracing -c Release -r android-arm64

Do stuff in the app, then:

    $ dotnet build -t:FinishTracing

See:

#7087

3. How do we get a list of method names from either the `.nettrace` or
   `.mibc` file? We track the methods in a text file in source control.

See:

https://github.com/xamarin/xamarin-android/blob/9b378e578fa4ff878281da113388f05a4027d484/src/profiled-aot/dotnet.aotprofile.txt
https://github.com/dotnet/maui/blob/08ca198145f27af96e0738853c341dbf33d47804/.nuspec/maui.aotprofile.txt

4. Is `@(AndroidMibcProfile)` the right name for the item group? Or
   should we use `@(AndroidAotProfile)` and just detect the `.mibc`
   file extension? `.mibc` files could pass `mibc-profile=` to the AOT
   compiler.

5. Is it OK if all methods are present in the `.mibc` file? With AOT
   profiles we did:

    aotprofile-tool -sd --filter-module="^(?!android).+" custom.aprof -o dotnet.aotprofile

This removed all methods from `android.dll`, which is the main
assembly of the app recorded.

https://github.com/radekdoulik/aotprofile-tool

~~ TODO ~~

Some things TODO even after the above questions are answered:

- [ ] - ship a `.mibc` file in our workload, setup defaults to use it
- [ ] - update `src/profiled-aot/build.proj` to record `.mibc`
  profiles. I just did them manually right now.
- [ ] - update dotnet/maui after this goes in

src/Xamarin.Android.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.Aot.targets

@@ -72,6 +72,7 @@ They run in a context of an inner build with a single $(RuntimeIdentifier).
         RuntimeIdentifier="$(RuntimeIdentifier)"
         EnableLLVM="$(EnableLLVM)"
         Profiles="@(AndroidAotProfile)"
+        MibcProfiles="@(AndroidMibcProfile)"
         StripLibraries="$(_AndroidAotStripLibraries)">
       <Output PropertyName="_Triple"     TaskParameter="Triple" />
       <Output PropertyName="_ToolPrefix" TaskParameter="ToolPrefix" />
@@ -84,6 +85,7 @@ They run in a context of an inner build with a single $(RuntimeIdentifier).
       <_MonoAOTAssemblies Update="@(_MonoAOTAssemblies)" ProcessArguments="$(AndroidExtraAotOptions)" />
     </ItemGroup>
     <PropertyGroup>
+      <_PgoBinaryPath Condition=" '$(_PgoBinaryPath)' == '' ">$(USERPROFILE)\.dotnet\tools\dotnet-pgo</_PgoBinaryPath>
       <_MonoAOTCompilerPath>@(MonoAotCrossCompiler->WithMetadataValue('RuntimeIdentifier', '$(RuntimeIdentifier)'))</_MonoAOTCompilerPath>
       <_LLVMPath Condition=" '$(EnableLLVM)' == 'true' ">$([System.IO.Path]::GetDirectoryName ('$(_MonoAOTCompilerPath)'))</_LLVMPath>
     </PropertyGroup>
@@ -105,6 +107,8 @@ They run in a context of an inner build with a single $(RuntimeIdentifier).
         LLVMPath="$(_LLVMPath)"
         LdName="$(_LdName)"
         LdFlags="$(_LdFlags)"
+        PgoBinaryPath="$(_PgoBinaryPath)"
+        NetTracePath="$(_NetTracePath)"
         WorkingDirectory="$(MSBuildProjectDirectory)"
         AotArguments="$(AndroidAotAdditionalArguments)">
       <Output TaskParameter="CompiledAssemblies" ItemName="_MonoAOTCompiledAssemblies" />

src/Xamarin.Android.Build.Tasks/Tasks/GetAotAssemblies.cs

@@ -1,7 +1,9 @@
+using System;
 using System.IO;
 using System.Text;
 using System.Threading.Tasks;
 using Microsoft.Android.Build.Tasks;
+using Microsoft.Build.Framework;
 using Xamarin.Android.Tools;
 
 namespace Xamarin.Android.Tasks
@@ -13,6 +15,8 @@ public class GetAotAssemblies : GetAotArguments
 	{
 		public override string TaskPrefix => "GAOT";
 
+		public ITaskItem [] MibcProfiles { get; set; } = Array.Empty<ITaskItem> ();
+
 		public override Task RunTaskAsync ()
 		{
 			NdkTools ndk = NdkTools.Create (AndroidNdkDirectory, logErrors: EnableLLVM, log: Log);
@@ -51,9 +55,14 @@ public override Task RunTaskAsync ()
 			if (Profiles != null && Profiles.Length > 0) {
 				aotProfiles.Append (",profile-only");
 				foreach (var p in Profiles) {
-					var fp = Path.GetFullPath (p.ItemSpec);
 					aotProfiles.Append (",profile=");
-					aotProfiles.Append (fp);
+					aotProfiles.Append (Path.GetFullPath (p.ItemSpec));
+				}
+			} else if (MibcProfiles != null && MibcProfiles.Length > 0) {
+				aotProfiles.Append (",profile-only");
+				foreach (var p in MibcProfiles) {
+					aotProfiles.Append (",mibc-profile=");
+					aotProfiles.Append (Path.GetFullPath (p.ItemSpec));
 				}
 			}
 

src/profiled-aot/Directory.Build.props

@@ -2,7 +2,8 @@
   <PropertyGroup>
     <Configuration>Release</Configuration>
     <AndroidNeedsInternetPermission>true</AndroidNeedsInternetPermission>
-    <AndroidEnableAotProfiler>true</AndroidEnableAotProfiler>
+    <!-- <AndroidEnableAotProfiler>true</AndroidEnableAotProfiler> -->
+    <AndroidEnableProfiler>true</AndroidEnableProfiler>
     <RunAOTCompilation>false</RunAOTCompilation>
   </PropertyGroup>
 

src/profiled-aot/Directory.Build.targets

@@ -6,18 +6,14 @@
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="$(MSBuildThisFileDirectory)CommonMethods.cs" />
-    <AndroidAotProfile Include="custom.aprof" />
-    <PackageReference Include="Mono.AotProfiler.Android" Version="7.0.0-preview1" />
+    <!-- <AndroidAotProfile Include="custom.aprof" />
+    <PackageReference Include="Mono.AotProfiler.Android" Version="7.0.0-preview1" /> -->
   </ItemGroup>
   <PropertyGroup>
     <RecordDependsOn>
       Clean;
       _ClearSystemProperties;
-      BuildAndStartAotProfiling;
-      _Sleep;
-      FinishAotProfiling;
-      _StripAppMethods;
-      _SaveMethodNames;
+      Run;
     </RecordDependsOn>
   </PropertyGroup>
   <Target Name="Record" DependsOnTargets="$(RecordDependsOn)">