[AArch64] Use SVE [SU]ABD in conditional arithmetic

[AArch64] Use SVE [SU]ABD in conditional arithmetic

This patch extends the [SU]ABD support so that it handles
conditional arithmetic.  We're relying on combine for this,
since there's no associated IFN_COND_* (yet?).

2019-08-15  Richard Sandiford  <richard.sandiford@arm.com>
	    Kugan Vivekanandarajah  <kugan.vivekanandarajah@linaro.org>

gcc/
	* config/aarch64/aarch64-sve.md (*aarch64_cond_<su>abd<mode>_2)
	(*aarch64_cond_<su>abd<mode>_any): New patterns.

gcc/testsuite/
	* gcc.target/aarch64/sve/cond_abd_1.c: New test.
	* gcc.target/aarch64/sve/cond_abd_1_run.c: Likewise.
	* gcc.target/aarch64/sve/cond_abd_2.c: Likewise.
	* gcc.target/aarch64/sve/cond_abd_2_run.c: Likewise.
	* gcc.target/aarch64/sve/cond_abd_3.c: Likewise.
	* gcc.target/aarch64/sve/cond_abd_3_run.c: Likewise.
	* gcc.target/aarch64/sve/cond_abd_4.c: Likewise.
	* gcc.target/aarch64/sve/cond_abd_4_run.c: Likewise.
	* gcc.target/aarch64/sve/cond_abd_5.c: Likewise.
	* gcc.target/aarch64/sve/cond_abd_5_run.c: Likewise.

Co-Authored-By: Kugan Vivekanandarajah <kuganv@linaro.org>
From-SVN: r274506