[clang] [HIP][SPIRV] Implicit `new`/`delete` should be `cdecl` on host (PR #152023)

[Chinmay Deshpande via cfe-commits]

https://github.com/chinmaydd approved this pull request.

LGTM. Specifically necessary to avoid CC clash on Windows for AMDGCNSPIRV

https://github.com/llvm/llvm-project/pull/152023