[clang] [Format] Fix isStartOfName to recognize attributes (PR #76804)

[kadir çetinkaya via cfe-commits]

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@@ -1698,8 +1698,6 @@ FormatStyle getGoogleStyle(FormatStyle::LanguageKind Language) {
           /*BasedOnStyle=*/"google",
       },
   };
-  GoogleStyle.AttributeMacros.push_back("GUARDED_BY");
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kadircet wrote:

FWIW, not recognizing `foo` in `int foo BAR` as start-of-name looks like a big enough regression (which seems to be the main reason behind the line-braking behavior change), independent of whatever we do with the list of attribute-macros, I believe we should still make sure annotations for `foo` are correct rather urgently. so I am actually still in favor of landing this patch as-is, rather than trying to fix final formatting in a bunch of special cases by updating `AtrributeMacros` list.

https://github.com/llvm/llvm-project/pull/76804