[clang] [llvm] [Driver][AMDGPU][HIP][SPIRV] Disable optimizations for AMDGCN SPIR-V (PR #154765)

[Sameer Sahasrabuddhe via llvm-commits]

ssahasra wrote:

For the record, I don't mean to hold up this patch with just my opinions, since clearly I am not the one spending time making SPIRV work for AMDGCN. Will defer to other people's review about the actual mechanics of the patch.

https://github.com/llvm/llvm-project/pull/154765