llvm-project

f4076e1c - [libc][math] Add gcc-7 to 9 compatibility for shared math. (#197868)

[libc][math] Add gcc-7 to 9 compatibility for shared math. (#197868) - Add more fine-grained constexpr annotations. - Apply fine-grained constexpr annotations to `src/__support`, `src/__support/FPUtil` folder. - Remove or update constexpr annotations for functions in `src/__support/math` folder. - Fix or ignore old gcc's warnings. Assisted-by: Gemini 3.1 Flash with step 3.