[clang] [clang-format] Wrap and indent lambda braces in GNU style (PR #135479)

[Owen Pan via cfe-commits]

================
@@ -1334,6 +1334,11 @@ unsigned ContinuationIndenter::getNewLineColumn(const LineState &State) {
            Style.IndentWidth;
   }
 
+  if (Style.BraceWrapping.BeforeLambdaBody &&
+      Style.BraceWrapping.IndentBraces && Current.is(TT_LambdaLBrace)) {
+    return CurrentState.Indent + Style.IndentWidth;
+  }
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owenca wrote:

> It might also be worth extracting the handling for `TT_LambdaLBrace` from the `if` just below and putting it here to keep it all together?

Not sure if it'd be worthwhile, but that can be done in another NFC patch.

https://github.com/llvm/llvm-project/pull/135479