[PATCH GCC]Enable vect_cond_mixed for AArch64.

[Bin Cheng]

Hi,
After supporting all vcond/vcondu patterns in AArch64 backend, now we can vectorize VEC_COND_EXPR with different type in comparison operands and value operands on AArch64.  GCC uses vect_cond_mixed to control such test cases, for now, there are below cases affected by it:

pr61194.c
    This was failed for all targets, but was just fixed by my previous tree ifcvt patch.
slp-cond-2-big-array.c
slp-cond-2.c
vect-cond-10.c
vect-cond-8.c
vect-cond-9.c

They will start passing after this patch.

Test on AArch64.  Is it OK?

Thanks,
bin

gcc/testsuite/ChangeLog
2016-05-12  Bin Cheng  <bin.cheng@arm.com>

	* lib/target-supports.exp (check_effective_target_vect_cond_mixed):
	Add aarch64*-*-*.
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