[compiler-rt] [win/asan] GetInstructionSize: Make `83 E4 XX` a generic entry. (PR #119644)

[via llvm-commits]

bernhardu wrote:

v2:
- patch is unchanged, just changed commit message to reflect this being a fix to return for `83 E4 F8` a 3 instead of 7.

https://github.com/llvm/llvm-project/pull/119644