[testsuite][AArch64] PR62308: Add testcase

[Christophe Lyon]

Hi,

While backporting the fix for PR62308 from trunk to 4.9-branch, it
appeared that a testcase would be useful.

Here it is. I'll send another email to request the backport of the fix
+ testcase to the 4.9-branch.

Christophe.

2015-06-18  Christophe Lyon  <christophe.l...@linaro.org>

        * gcc.target/aarch64/pr62308.c: New test.

[my mailer seems to break the ChangeLog indentation]

/* { dg-do compile } */
/* { dg-options "-mbig-endian" } */

typedef int __attribute__((vector_size(16))) v4si;
struct S2823 {v4si a;int b[0];};
void checkx2823 (struct S2823 args){};