Plumb the DeclContext of the use site down to the "doesVarDeclMemberProduceLValue"

function.  Pretty soon, whether something is an lvalue or not will depend on who is
asking.


Swift SVN r12507

lib/Sema/ConstraintSystem.cpp

@@ -647,7 +647,7 @@ ConstraintSystem::getTypeOfReference(ValueDecl *value,
   }
 
   // Determine the type of the value, opening up that type if necessary.
-  Type valueType = TC.getUnopenedTypeOfReference(value, Type(),
+  Type valueType = TC.getUnopenedTypeOfReference(value, Type(), DC,
                                                  /*wantInterfaceType=*/true);
 
   // Adjust the type of the reference.
@@ -843,7 +843,7 @@ ConstraintSystem::getTypeOfMemberReference(Type baseTy, ValueDecl *value,
     openedType = openType(genericFn, dc, /*skipProtocolSelfConstraint=*/true,
                           opener);
   } else {
-    openedType = TC.getUnopenedTypeOfReference(value, baseTy,
+    openedType = TC.getUnopenedTypeOfReference(value, baseTy, DC,
                                                /*wantInterfaceType=*/true);
 
     Type selfTy;