Add testcase to ensure that #pragma GCC diagnostic push/pop works with -Wtraditional

2017-05-18  Eric Gallager  <egall@gwmail.gwu.edu>

	* gcc.dg/pragma-diag-7.c: New test.

From-SVN: r248253

gcc/testsuite/ChangeLog

+2017-05-18  Eric Gallager  <egall@gwmail.gwu.edu>
+
+	* gcc.dg/pragma-diag-7.c: New test.
+
 2017-05-18  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/80799

gcc/testsuite/gcc.dg/pragma-diag-7.c

+/* { dg-do compile } */
+
+unsigned long ok = 0UL;
+#pragma GCC diagnostic push
+#pragma GCC diagnostic warning "-Wtraditional"
+unsigned long bad = 1UL; /* { dg-warning "suffix" } */
+/* Note the extra space before the pragma on this next line: */
+ #pragma GCC diagnostic pop
+unsigned long ok_again = 2UL; /* { dg-bogus "suffix" } */