Add ISMETHOD and ISMETHODHASH macros

[EgorBo]

This PR adds ISMETHOD and ISMETHODHASH macros so one can do something like:

if (ISMETHOD("Main"))
{
; // break or some printf when JIT compiles "Main" function
}

Same for ISMETHODHASH(424242) which is useful when one debugs superpmi failures

@dotnet/jit-contrib @SingleAccretion do you find it useful? I personally write such strcmp quite often 🙂

Also, this PR changes types for gtCallType and gtReturnType to corresponding enums for better intellisense (enums have the same underlying type - unsigned char)

[ghost]

Tagging subscribers to this area: @JulieLeeMSFT
See info in area-owners.md if you want to be subscribed.

Issue Details

---

This PR adds ISMETHOD and ISMETHODHASH macros so one can do something like:

if (ISMETHOD("Main"))
{
; // break or some printf when JIT compiles "Main" function
}

Same for ISMETHODHASH(424242) which is useful when one debugs superpmi failures

@dotnet/jit-contrib @SingleAccretion do you find it useful?

Also, this PR changes types for gtCallType and gtReturnType to corresponding enums for better intellisense (enums have the same underlying type - unsigned char)

Author:	EgorBo
Assignees:	-
Labels:	area-CodeGen-coreclr
Milestone:	-

[BruceForstall]

These are intended to be used only when you are actively working on an issue and writing custom debugging code, right? So you would never expect to check in code that uses them?

It seems like you should add comments to that effect. In fact, maybe you should check these in commented out, and anyone who wants to use them can uncomment them at the same time as writing code to use them?

[EgorBo]

These are intended to be used only when you are actively working on an issue and writing custom debugging code, right? So you would never expect to check in code that uses them?

It seems like you should add comments to that effect. In fact, maybe you should check these in commented out, and anyone who wants to use them can uncomment them at the same time as writing code to use them?

Changed to be available only in DEBUG/CHECKED and it won't compile in Release so nobody will be able to check it in