[clang] [clang] Fix lifetime extension of temporaries in for-range-initializers in templates (PR #177191)

[Erich Keane via cfe-commits]

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@@ -3017,6 +3009,13 @@ StmtResult Sema::BuildCXXForRangeStmt(
   if (getLangOpts().OpenMP >= 50 && BeginDeclStmt.isUsable())
     OpenMP().ActOnOpenMPLoopInitialization(ForLoc, BeginDeclStmt.get());
 
+  // P2718R0 - Lifetime extension in range-based for loops.
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erichkeane wrote:

I'm not quite sure I get why this works?  Can you explain what the problem is better? 

https://github.com/llvm/llvm-project/pull/177191