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

[Björn Schäpers via cfe-commits]

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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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HazardyKnusperkeks wrote:

Yeah I know, but can we chime in, where the type is set to `TT_FunctionLBrace` in `TokenAnnotator` and perform the magic there? It would collapse to some `if`s, and two hops through `MatchingParen`, and two `getPreviousNonComment()` vs. this loop.

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