Bug fix: for the base transfer function logic for casts, handle const casts as just propagating the value.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@56368 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/GRExprEngine.cpp

@@ -1433,6 +1433,15 @@ void GRExprEngine::VisitCast(Expr* CastE, Expr* Ex, NodeTy* Pred, NodeSet& Dst){
       continue;
     }
     
+    // For const casts, just propagate the value.
+    ASTContext& C = getContext();
+    
+    if (C.getCanonicalType(T).getUnqualifiedType() == 
+        C.getCanonicalType(ExTy).getUnqualifiedType()) {
+      MakeNode(Dst, CastE, N, SetRVal(St, CastE, V));
+      continue;
+    }
+  
     // Check for casts from pointers to integers.
     if (T->isIntegerType() && LVal::IsLValType(ExTy)) {
       unsigned bits = getContext().getTypeSize(ExTy);