Improve c-style cast detection.

Before:
return (my_int) aaaa;
template <> void f<int>(int i)SOME_ANNOTATION;
f("aaaa" SOME_MACRO(aaaa)"aaaa");

After:
return (my_int)aaaa;
template <> void f<int>(int i) SOME_ANNOTATION;
f("aaaa" SOME_MACRO(aaaa) "aaaa");

llvm-svn: 183389