[test] Clang is now more strict about underlying type enums

As of c90e198, clang is now more strict
about parsing of enum-base in order to follow C++11 rules.

Author: davezarzycki

test/DebugInfo/Inputs/Macro.h

@@ -1,6 +1,12 @@
+#ifdef __cplusplus
 #define MY_ENUM(NAME) \
-  enum NAME : int NAME; \
   enum NAME : int
+#else
+#define MY_ENUM(NAME) \
+  enum NAME : int; \
+  typedef enum NAME NAME; \
+  enum NAME : int
+#endif
 
 MY_ENUM(macro_enum) {
   zero = 0