[clang] [Sema] Fix lifetime extension for temporaries in range-based for loops in C++23 (PR #145164)

[Marco Vitale via cfe-commits]

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@@ -1585,6 +1590,20 @@ class VarDecl : public DeclaratorDecl, public Redeclarable<VarDecl> {
     NonParmVarDeclBits.IsCXXCondDecl = true;
   }
 
+  /// Determine whether this variable is the compiler-generated '__range'
+  /// variable used to hold the range expression in a C++11 and later for-range
+  /// statement.
+  bool isCXXForRangeImplicitVar() const {
+    return isa<ParmVarDecl>(this) ? false
+                                  : NonParmVarDeclBits.IsCXXForRangeImplicitVar;
+  }
+
+  void setCXXForRangeImplicitVar(bool FRV) {
+    assert(!isa<ParmVarDecl>(this) &&
+           "Cannot set IsCXXForRangeRangeVar on ParmVarDecl");
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mrcvtl wrote:

Also here should be `Cannot set IsCXXForRangeRangeVar...`. 

https://github.com/llvm/llvm-project/pull/145164