new testcase that crashed clang

llvm-svn: 39315
diff --git a/clang/test/Parser/argument_qualified.c b/clang/test/Parser/argument_qualified.c
new file mode 100644
index 0000000..cd92c32
--- /dev/null
+++ b/clang/test/Parser/argument_qualified.c
@@ -0,0 +1,5 @@
+// RUN: clang %s
+int abc (const float x) {
+  return 1;
+}
+