Index: clang/lib/AST/ExprConstant.cpp
===================================================================
--- clang/lib/AST/ExprConstant.cpp
+++ clang/lib/AST/ExprConstant.cpp
@@ -15781,7 +15781,7 @@
   assert(!isValueDependent() &&
          "Expression evaluator can't be called on a dependent expression.");
   bool IsConst;
-  if (FastEvaluateAsRValue(this, Result, Ctx, IsConst))
+  if (FastEvaluateAsRValue(this, Result, Ctx, IsConst) && IsConst)
     return true;
 
   ExprTimeTraceScope TimeScope(this, Ctx, "EvaluateAsConstantExpr");