Remote: use the qualified name for NodePointer

Use the qualified name for the `NodePointer`.  The unqualified name
causes ambiguity when building on Windows.  This repairs the Windows
build.

Author: compnerd

include/swift/Remote/MetadataReader.h

@@ -1480,7 +1480,7 @@ class MetadataReader {
       return nullptr;
 
     // Dig out the name of the entity.
-    NodePointer nameChild = mangledNode->getChild(1);
+    swift::Demangle::NodePointer nameChild = mangledNode->getChild(1);
     if ((nameChild->getKind() != Node::Kind::PrivateDeclName &&
          nameChild->getKind() != Node::Kind::LocalDeclName) ||
         nameChild->getNumChildren() < 2)