[clang] [clang] Introduce target-specific `Sema` components (PR #93179)

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

The only thing clang-format complain about is switches for builtins for ARM, Hexagon, MIPS, and SystemZ. I don't feel like it makes improvements there, but open for input from contributors in those areas.

https://github.com/llvm/llvm-project/pull/93179