[clang] [llvm] [Clang][LLVM] Add -finline-stringops=memset and inline-stringops attribute (PR #231163)

[Arth Srivastava via cfe-commits]

Blazearth wrote:

>Any AI use?

Yes. I used Google Antigravity (Gemini 3.8) and GPT-6 for design exploration, implementation assistance, and test development. I reviewed the resulting changes and ran the build and focused regression tests locally. 

https://github.com/llvm/llvm-project/pull/231163