llvm-project

98244c4e - [libc++] Upstream ptrauth support in libc++ and libc++abi (#84573)

[libc++] Upstream ptrauth support in libc++ and libc++abi (#84573) This is an exact upstreaming of the downstream diff. Minor simplifications can be made in the future but upstreaming as-is will make it easier for us to deal with downstream merge conflicts. Partially fixes #83805