Tidy up now that PointerUnion has an operator== that works.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181983 91177308-0d34-0410-b5e6-96231b3b80d8

lib/AST/ExprConstant.cpp

@@ -1080,8 +1080,7 @@ static bool CheckLiteralType(EvalInfo &Info, const Expr *E,
   // constexpr constructors for o and its subobjects even if those objects
   // are of non-literal class types.
   if (Info.getLangOpts().CPlusPlus1y && This &&
-      Info.EvaluatingDecl.getOpaqueValue() ==
-          This->getLValueBase().getOpaqueValue())
+      Info.EvaluatingDecl == This->getLValueBase())
     return true;
 
   // Prvalue constant expressions must be of literal types.