[Orc] Switch to new visibility macros for JIT debug symbols

Use LLVM_ALWAYS_EXPORT for __jit_debug_descriptor and __jit_debug_register_code so
there exported even if LLVM is not built as a shared library.

This is part of the work to enable LLVM_BUILD_LLVM_DYLIB and plugins on windows llvm#109483.

llvm/lib/ExecutionEngine/Orc/TargetProcess/JITLoaderGDB.cpp

@@ -11,6 +11,7 @@
 #include "llvm/ExecutionEngine/JITSymbol.h"
 #include "llvm/Support/BinaryStreamReader.h"
 #include "llvm/Support/FormatVariadic.h"
+#include "llvm/Support/Compiler.h"
 
 #include <cstdint>
 #include <mutex>
@@ -26,13 +27,13 @@ extern "C" {
 // We put information about the JITed function in this global, which the
 // debugger reads.  Make sure to specify the version statically, because the
 // debugger checks the version before we can set it during runtime.
-LLVM_ATTRIBUTE_VISIBILITY_DEFAULT
+LLVM_ALWAYS_EXPORT
 struct jit_descriptor __jit_debug_descriptor = {JitDescriptorVersion, 0,
                                                 nullptr, nullptr};
 
 // Debuggers that implement the GDB JIT interface put a special breakpoint in
 // this function.
-LLVM_ATTRIBUTE_VISIBILITY_DEFAULT
+LLVM_ALWAYS_EXPORT
 LLVM_ATTRIBUTE_NOINLINE void __jit_debug_register_code() {
   // The noinline and the asm prevent calls to this function from being
   // optimized out.

llvm/tools/lli/lli.cpp

@@ -50,6 +50,7 @@
 #include "llvm/Object/Archive.h"
 #include "llvm/Object/ObjectFile.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Compiler.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/DynamicLibrary.h"
 #include "llvm/Support/Format.h"
@@ -751,7 +752,7 @@ int main(int argc, char **argv, char * const *envp) {
 
 // JITLink debug support plugins put information about JITed code in this GDB
 // JIT Interface global from OrcTargetProcess.
-extern "C" struct jit_descriptor __jit_debug_descriptor;
+extern "C" LLVM_ABI struct jit_descriptor __jit_debug_descriptor;
 
 static struct jit_code_entry *
 findNextDebugDescriptorEntry(struct jit_code_entry *Latest) {

llvm/tools/llvm-jitlink/llvm-jitlink-executor/llvm-jitlink-executor.cpp

@@ -17,6 +17,7 @@
 #include "llvm/ExecutionEngine/Orc/TargetProcess/RegisterEHFrames.h"
 #include "llvm/ExecutionEngine/Orc/TargetProcess/SimpleExecutorMemoryManager.h"
 #include "llvm/ExecutionEngine/Orc/TargetProcess/SimpleRemoteEPCServer.h"
+#include "llvm/Support/Compiler.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/DynamicLibrary.h"
 #include "llvm/Support/Error.h"
@@ -117,7 +118,7 @@ int openListener(std::string Host, std::string PortStr) {
 
 // JITLink debug support plugins put information about JITed code in this GDB
 // JIT Interface global from OrcTargetProcess.
-extern "C" struct jit_descriptor __jit_debug_descriptor;
+extern "C" LLVM_ABI struct jit_descriptor __jit_debug_descriptor;
 
 static void *findLastDebugDescriptorEntryPtr() {
   struct jit_code_entry *Last = __jit_debug_descriptor.first_entry;