Format string analysis: give 'q' its own enumerator.

This is in preparation for being able to warn about 'q' and other
non-standard format string features.

It also allows us to print its name correctly.

llvm-svn: 150697

clang/test/Sema/format-strings-scanf.c

@@ -117,3 +117,7 @@ void test_longlong(long long *x, unsigned long long *y) {
   scanf("%Ls", "hello"); // expected-warning {{length modifier 'L' results in undefined behavior or no effect with 's' conversion specifier}}
 }
 
+void test_quad(int *x, long long *llx) {
+  scanf("%qd", x); // expected-warning{{format specifies type 'long long *' but the argument has type 'int *'}}
+  scanf("%qd", llx); // no-warning
+}