[llvm] [Offload][AMDGPU] Make compiler-rt libs visible (PR #209849)

[Kewen Meng via llvm-commits]

Kewen12 wrote:

I can confirm the builtins exists here: `build/lib/clang/24/lib/amdgpu-amd-amdhsa/libclang_rt.builtins.a` and clang invokes `--device-linker=amdgpu-amd-amdhsa=-lclang_rt.builtins` but I didn't find sth like `-L/lib/clang/24/lib/amdgpu-amd-amdhsa` expected from clang.

https://github.com/llvm/llvm-project/pull/209849