testcase for PR c/36299

[Vincent Lefevre]

As asked in PR c/36299[*], here's a testcase for this PR. It checks
the absence of warning for some valid C code, to make sure the warning
no longer reappears in future GCC versions.

[*] http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36299#c10

-- 
Vincent Lefèvre <vinc...@vinc17.net> - Web: <http://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / Arénaire project (LIP, ENS-Lyon)

/* PR c/36299 */
/* { dg-do compile } */
/* { dg-options "-Waddress" } */

int
foo(void)
{
  char a[1];
  return a == 0;
}