Allow functions for AVX target inline functions for lower target.

Allow functions for AVX target inline functions for lower target.

Allow functions for AVX target inline functions for lower target.  This bug was
reported here: http://gcc.gnu.org/ml/gcc-patches/2013-06/msg01620.html

2013-07-02  Sriraman Tallam  <tmsriram@google.com>

	* config/i386/i386.c (gate_insert_vzeroupper): Check if target
	ISA is AVX.
	(ix86_option_override_internal):Turn on all -mavx target flags by
	default as they are dependent on AVX anyway.

	* gcc.target/i386/avx-inline.c: New test.

From-SVN: r200627