[PR87563][AARCH64-SVE]: Don't keep ifcvt loop when COND_<OP> ifn could not be vectorized.

[PR87563][AARCH64-SVE]: Don't keep ifcvt loop when COND_<OP> ifn could not be vectorized.

ifcvt will created versioned loop and it will permissively generate
scalar COND_<OP> ifn.

If in the loop vectorize pass, COND_<OP> could not get vectoized,
the if-converted loop should be abandoned when the target doesn't support
such ifn.

gcc/

2018-10-12  Renlin Li  <renlin.li@arm.com>

	PR target/87563
	* tree-vectorizer.c (try_vectorize_loop_1): Don't use
	if-conversioned loop when it contains ifn with types not
	supported by backend.
	* internal-fn.c (expand_direct_optab_fn): Add an assert.
	(direct_internal_fn_supported_p): New helper function.
	* internal-fn.h (direct_internal_fn_supported_p): Declare.

gcc/testsuite/

2018-10-12  Renlin Li  <renlin.li@arm.com>

	PR target/87563
	* gcc.target/aarch64/sve/pr87563.c: New.

From-SVN: r265172