[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.

- 082b89b: [builtins] Reformat builtins with clang-format
- 0ba22f5: [builtins] Use single line C++/C99 comment style
- 84da0e1: [builtins] Use aliases for function redirects

Author: piggynl

.git-blame-ignore-revs

@@ -73,3 +73,8 @@ f6d557ee34b6bbdb1dc32f29e34b4a4a8ad35e81
 
 # [libc++] Format the code base (#74334)
 9783f28cbb155e4a8d49c12e1c60ce14dcfaf0c7
+
+# [RFC] compiler-rt builtins cleanup and refactoring
+082b89b25faae3e45a023caf51b65ca0f02f377f
+0ba22f51d128bee9d69756c56c4678097270e10b
+84da0e1bb75f8666cf222d2f600f37bebb9ea389