Change warning about incomplete parsing of C++ default arg to error and provide a test case; thanks Doug!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@110603 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Parser/cxx-default-args.cpp b/test/Parser/cxx-default-args.cpp
index a7bb5ee..7fe8474 100644
--- a/test/Parser/cxx-default-args.cpp
+++ b/test/Parser/cxx-default-args.cpp
@@ -10,3 +10,7 @@
 typedef struct Inst {
   void m(int x=0);
 } *InstPtr;
+
+struct X {
+  void f(int x = 1:); // expected-error {{unexpected end of default argument expression}}
+};