[clang][Sema][SYCL] Fix MSVC STL usage on AMDGPU (#135979)

The MSVC STL includes specializations of `_Is_memfunptr` for every
function pointer type, including every calling convention.

The problem is the AMDGPU target doesn't support the x86 `vectorcall`
calling convention so clang sets it to the default CC. This ends up
clashing with the already-existing overload for the default CC, so we
get a duplicate definition error when including `type_traits` (which we
heavily use in the SYCL STL) and compiling for AMDGPU on Windows.

This doesn't happen for pure AMDGPU non-SYCL because it doesn't include
the C++ STL, and it doesn't happen for CUDA/HIP because a similar
workaround was done
[here](https://github.com/llvm/llvm-project/commit/fa49c3a888e816969b5ed68cd5c47efc3eb9419f).

I am not an expert in Sema, so I did a kinda of hardcoded fix, please
let me know if there is a better way to fix this.

As far as I can tell we can't do exactly the same fix that was done for
CUDA because we can't differentiate between device and host code so
easily.

---------

Signed-off-by: Sarnie, Nick <nick.sarnie@intel.com>
3 files changed
tree: 14611eaf35cceadbc2633369d90a6112297932ec
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. flang-rt/
  11. libc/
  12. libclc/
  13. libcxx/
  14. libcxxabi/
  15. libunwind/
  16. lld/
  17. lldb/
  18. llvm/
  19. llvm-libgcc/
  20. mlir/
  21. offload/
  22. openmp/
  23. polly/
  24. pstl/
  25. runtimes/
  26. third-party/
  27. utils/
  28. .clang-format
  29. .clang-format-ignore
  30. .clang-tidy
  31. .git-blame-ignore-revs
  32. .gitattributes
  33. .gitignore
  34. .mailmap
  35. CODE_OF_CONDUCT.md
  36. CONTRIBUTING.md
  37. LICENSE.TXT
  38. pyproject.toml
  39. README.md
  40. SECURITY.md
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