Implement __builtin_printf, __builtin_fprintf. Fixes <rdar://problem/8336581>.

llvm-svn: 112049
diff --git a/clang/test/Sema/builtins.c b/clang/test/Sema/builtins.c
index 7d6d54d..787630c 100644
--- a/clang/test/Sema/builtins.c
+++ b/clang/test/Sema/builtins.c
@@ -90,3 +90,8 @@
   int old;
   old = __sync_fetch_and_min((volatile int *)&old, 1);
 }
+
+// <rdar://problem/8336581>
+void test15(const char *s) {
+  __builtin_printf("string is %s\n", s);
+}