[AArch64] Add SVE conditional integer unary patterns

[AArch64] Add SVE conditional integer unary patterns

This patch adds patterns to match conditional unary operations
on integers.  At the moment we rely on combine to merge separate
arithmetic and vcond_mask operations, and since the latter doesn't
accept zero operands, we miss out on the opportunity to use the
movprfx /z alternative.  (This alternative is tested by the ACLE
patches though.)

2019-08-14  Richard Sandiford  <richard.sandiford@arm.com>
	    Kugan Vivekanandarajah  <kugan.vivekanandarajah@linaro.org>

gcc/
	* config/aarch64/aarch64-sve.md
	(*cond_<SVE_INT_UNARY:optab><SVE_I:mode>_2): New pattern.
	(*cond_<SVE_INT_UNARY:optab><SVE_I:mode>_any): Likewise.

gcc/testsuite/
	* gcc.target/aarch64/sve/cond_unary_1.c: New test.
	* gcc.target/aarch64/sve/cond_unary_1_run.c: Likewise.
	* gcc.target/aarch64/sve/cond_unary_2.c: Likewise.
	* gcc.target/aarch64/sve/cond_unary_2_run.c: Likewise.
	* gcc.target/aarch64/sve/cond_unary_3.c: Likewise.
	* gcc.target/aarch64/sve/cond_unary_3_run.c: Likewise.
	* gcc.target/aarch64/sve/cond_unary_4.c: Likewise.
	* gcc.target/aarch64/sve/cond_unary_4_run.c: Likewise.

Co-Authored-By: Kugan Vivekanandarajah <kuganv@linaro.org>
From-SVN: r274476