[llvm-branch-commits] [NFC] [hwasan] factor get[PC|FP] out of HWASan class (PR #84404)

[Florian Mayer via llvm-branch-commits]

https://github.com/fmayer created https://github.com/llvm/llvm-project/pull/84404

Also be consistent about naming SP / FP.

This is to prepare for stack history buffer for memtag-stack