[clang] [clang-format] Keep compound literals stable in macro bodies (PR #173771)

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@@ -528,7 +553,16 @@ void UnwrappedLineParser::calculateBraceTypes(bool ExpectClassBody) {
           Tok->setBlockKind(BK_Block);
         }
       } else {
-        Tok->setBlockKind(BK_Unknown);
+        // In macro bodies we try to keep compound literal expressions like
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Lane0218 wrote:

Thanks for the suggestions!

I followed @owenca’s requested direction and switched to a smaller parser-side fix (in `parseParens`) rather than the loop/heuristic in `calculateBraceTypes`. I also added a `TokenAnnotatorTest` regression that checks the brace kind for `&(type){v}` is `BK_BracedInit`.

Thanks again — I agree a more general TokenAnnotator/MatchingParen-based approach could be a good follow-up refactor, but I’m trying to keep this PR minimal.

Tests: FormatTests

https://github.com/llvm/llvm-project/pull/173771