Don't pass booleans as mask types to simd clones (PR 92710)

Don't pass booleans as mask types to simd clones (PR 92710)

In this PR we assigned a vector mask type to the result of a comparison
and then tried to pass that mask type to a simd clone, which expected
a normal (non-mask) type instead.

This patch simply punts on call arguments that have a mask type.
A better fix would be to pattern-match the comparison to a COND_EXPR,
like we would if the comparison was stored to memory, but doing that
isn't gcc 9 or 10 material.

Note that this doesn't affect x86_64-linux-gnu because the ABI promotes
bool arguments to ints.

2019-11-29  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	PR tree-optimization/92710
	* tree-vect-stmts.c (vectorizable_simd_clone_call): Reject
	vector mask arguments.

gcc/testsuite/
	PR tree-optimization/92710
	* gcc.dg/vect/pr92710.c: New test.

From-SVN: r278839