[clang] Make [[clang::lifetimebound]] work for expressions coming from default arguments (PR #112047)

[via cfe-commits]

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@@ -1370,7 +1381,7 @@ static void checkExprLifetimeImpl(Sema &SemaRef,
         break;
       }
 
-      case IndirectLocalPathEntry::LambdaCaptureInit:
+      case IndirectLocalPathEntry::LambdaCaptureInit: {
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higher-performance wrote:

It's not unrelated. If I take out the braces then the code won't compile due to the `case` skipping the declaration inside.

https://github.com/llvm/llvm-project/pull/112047