[clr-interp] Add support for logging interpreter IR ranges to perf map

[BrzVlad]

Tested that it works correctly when passing the following env vars to the runtime:

export DOTNET_PerfMapEnabled=1
export DOTNET_PerfMapStubGranularity=2

The interpreter entries from the perf map could be used to profile as described in https://gist.github.com/BrzVlad/80c1b1f61b024f251b60f39c5dedc9d3

[dotnet-policy-service]

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

[Copilot]

Pull request overview

This PR extends CoreCLR’s perf-map logging to include interpreter-generated IR ranges, so profiler tools can symbolize interpreter frames similarly to JIT-compiled methods.

Changes:

• Add PerfMap::LogInterpreterMethod(...) API (guarded by FEATURE_INTERPRETER) and implement logging of interpreter IR ranges.
• Update MethodDesc::JitCompileCodeLockedEventWrapper to log interpreter IR ranges instead of logging the interpreter entrypoint as a JIT-compiled method.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/coreclr/vm/prestub.cpp	Adds interpreter-specific perfmap logging in the JIT/compile wrapper.
src/coreclr/vm/perfmap.h	Declares the new interpreter logging entrypoint on PerfMap.
src/coreclr/vm/perfmap.cpp	Implements interpreter IR range logging to the perfmap output.

[BrzVlad]

Example usage: ~/profile.sh x27 ./corerun gettype.dll. The automated register fetching via script-find-ip-reg.sh is not very reliable, it worked fine with checked build but no longer with release (maybe due to the computed goto change). Copilot can easily tweak the script or detect the real register from the disassembly however. EDIT: Updated the script to a new mechanism based on load + br.

Normal perf output (non-descriptive InterpMethodExec)

    79.36%  corerun         libcoreclr.so          [.] InterpExecMethod(InterpreterFrame*, InterpMethodContextFrame*, InterpThreadContext*, ExceptionClauseArgs*)
     4.89%  corerun         libc.so.6              [.] __memset_zva64
     4.74%  corerun         libcoreclr.so          [.] FrameDataAllocator::PopInfo(InterpMethodContextFrame*)
     2.10%  corerun         ld-linux-aarch64.so.1  [.] _dl_tlsdesc_dynamic
     1.99%  corerun         libcoreclr.so          [.] memset@plt
     1.32%  corerun         libcoreclr.so          [.] InterpreterStub
     1.08%  corerun         libcoreclr.so          [.] ErectWriteBarrier(Object**, Object*)
     0.60%  corerun         libcoreclr.so          [.] ExecuteInterpretedMethod

Parsed interp execution:

Samples       %  Method
 -------     ---  ------
    2590   22.4%  [Interpreter] void [System.Private.CoreLib] System.SpanHelpers::Memmove(uint8&,uint8&,native uint)
    1070    9.2%  [Interpreter] object [System.Private.CoreLib] System.Runtime.CompilerServices.CastHelpers::Box(valuetype System.Runtime.CompilerServices.MethodTable*,uint8&)
     860    7.4%  [Interpreter] instance bool [System.Linq] System.Linq.Enumerable+RepeatIterator`1[System.Int32]::MoveNext()
     729    6.3%  [Interpreter] void [gettype] ConsumerExtensions::Consume(class [System.Runtime]System.Collections.IEnumerable,class Consumer)
     685    5.9%  [Interpreter] !!0& [System.Private.CoreLib] System.Runtime.CompilerServices.Unsafe::Add(!!0&,int32)
     588    5.1%  [Interpreter] object [System.Private.CoreLib] System.RuntimeTypeHandle::InternalAllocNoChecks(valuetype System.Runtime.CompilerServices.MethodTable*)
     551    4.8%  [Interpreter] !!0 [System.Private.CoreLib] System.Runtime.CompilerServices.Unsafe::ReadUnaligned(uint8&)
     535    4.6%  [Interpreter] !!0& [System.Private.CoreLib] System.Runtime.CompilerServices.Unsafe::Add(!!0&,native uint)
....
       1    0.0%  [Interpreter] instance void [gettype] Program::BenchRepeat()
       1    0.0%  [Interpreter] instance void [System.Private.CoreLib] System.Object::.ctor()

Total samples: 14576, in InterpExecMethod: 11568 (79.4%), resolved: 11370 (98.3%)