[compiler-rt] [compiler-rt] Use mangled function names on ARM64EC (PR #137960)

[Jacek Caban via llvm-commits]

cjacek wrote:

FWIW, the formatting warnings are from clang-format trying to adjust indentation in modified macros. I believe the current formatting is intentional and is meant to remain unchanged.

https://github.com/llvm/llvm-project/pull/137960