Included assert.h so that the code compiles under newer versions of GCC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6682 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/Annotation.h

@@ -16,6 +16,7 @@
 #define SUPPORT_ANNOTATION_H
 
 #include <string>
+#include <assert.h>
 class AnnotationID;
 class Annotation;
 class Annotable;