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.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150697 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Sema/format-strings-scanf.c b/test/Sema/format-strings-scanf.c
index c97da3f..e94af5a 100644
--- a/test/Sema/format-strings-scanf.c
+++ b/test/Sema/format-strings-scanf.c
@@ -117,3 +117,7 @@
   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
+}