[PATCH][PR63661]Add a test case for trunk.

[Renlin Li]

Hi all,

PR63661 is effectively fixed by my previous patch here: 
https://gcc.gnu.org/ml/gcc-patches/2014-11/msg02253.html

This patch add a test case for it.

Okay for trunk?

gcc/testsuite/ChangeLog:

2014-11-27  Renlin Li  <Renlin.Li@arm.com>

      PR target/63661
     * gcc.target/i386/pr63661.c: New.
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