[clang] [llvm] [AMDGPU] Infer amdgpu-no-flat-scratch-init attribute in AMDGPUAttributor (PR #118907)

[Jun Wang via cfe-commits]

jwanggit86 wrote:

[PR 94647](https://github.com/llvm/llvm-project/pull/94647) was found to cause build problems after merge with upstream. It has since been reverted by commit 1ef9410a96c1d9669a6feaf03fcab8d0a4a13bd5. This PR fixes the tests that caused the build problems.

https://github.com/llvm/llvm-project/pull/118907