Include xmmintrin.h early on x86 as well

[jkoritzinsky]

We're hitting problems with our debugreturn.h machinery on x86 with Clang 20. Include xmmintrin.h early on that platform as well to work around it.

Related: #113248

[Copilot]

Copilot reviewed 1 out of 1 changed files in this pull request and generated no comments.

[dotnet-policy-service]

Tagging subscribers to this area: @mangod9
See info in area-owners.md if you want to be subscribed.

[am11]

The other error is:

[ 86%] Linking CXX shared library libDllImportPath_Relative.so
/__w/1/s/src/tests/Interop/DllImportAttribute/DllImportPath/DllImportPathNative.cpp:13:24: error: 'main' should not be 'extern "C"' [-Werror,-Wmain]
   13 | extern "C" int __cdecl main(int argc,  char **argv)
      |                        ^

[richlander]

Thanks for your help @am11!

[am11]

@jkoritzinsky I think we can remove extern "C" from this line

runtime/src/tests/Interop/DllImportAttribute/DllImportPath/DllImportPathNative.cpp

Line 13 in 2ec50bd

extern "C" int __cdecl main(int argc, char **argv)

as part of this PR or a separate one. With that, the builds on 64-bit platforms also succeed.

[sbomer]

Thanks @jkoritzinsky and @am11!