[clang] [clang-tools-extra] [Clang] [C2y] Implement N3355 ‘NamedLoops’ (PR #152870)

[Shafik Yaghmour via cfe-commits]

================
@@ -679,11 +685,17 @@ static void DiagnoseLabelFollowedByDecl(Parser &P, const 
Stmt *SubStmt) {
   }
 }
 
-StmtResult Parser::ParseLabeledStatement(ParsedAttributes &Attrs,
-                                         ParsedStmtContext StmtCtx) {
+StmtResult
+Parser::ParseLabeledStatement(ParsedAttributes &Attrs,
+                              ParsedStmtContext StmtCtx,
+                              SmallVectorImpl<LabelDecl *> *LoopOrSwitchNames) 
{
   assert(Tok.is(tok::identifier) && Tok.getIdentifierInfo() &&
          "Not an identifier!");
 
+  SmallVector<LabelDecl *, 1> LoopOrSwitchNamesStorage;
----------------
shafik wrote:

This feels like a bit overly clever code here and the next two lines. 

https://github.com/llvm/llvm-project/pull/152870
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