[NFC] Update .git-blame-ignore-revs for compiler-rt builtins (#79803)

The three commits from "[RFC] compiler-rt builtins cleanup and
refactoring" rewrote lots of code in compiler-rt builtins.

- 082b89b2: [builtins] Reformat builtins with clang-format
- 0ba22f51: [builtins] Use single line C++/C99 comment style
- 84da0e1b: [builtins] Use aliases for function redirects