[Clang] Add standalone AMDGPU SPIR-V toolchain (#144576) Summary: The AMDGPU toolchain uses a different set of tools than the standard SPIR-V toolchain. The linker wrapper prefers to invoke a linker via a clang toolchain. To make that work we introduce `--target=spirv64-amd-amdhsa` so that it creates the linking phases that HIP prefers. Additionally, this can be used to make LLVM-IR / SPIR-V from C/C++ that can be linked with the HIP output.
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