[analyzer] Treat nullPtrType as a location type.

Fixes PR16584 (radar://14415223).

llvm-svn: 186172
diff --git a/clang/test/Analysis/nullptr.cpp b/clang/test/Analysis/nullptr.cpp
index 050c3f8..56151dc 100644
--- a/clang/test/Analysis/nullptr.cpp
+++ b/clang/test/Analysis/nullptr.cpp
@@ -81,3 +81,9 @@
   const S &s = S(*n); // expected-warning{{Dereference of null pointer}}
   return s.a;
 }
+
+typedef decltype(nullptr) nullptr_t;
+void testMaterializeTemporaryExprWithNullPtr() {
+  // Create MaterializeTemporaryExpr with a nullptr inside.
+  const nullptr_t &r = nullptr;
+}