[AArch64] Use SVE FABD in conditional arithmetic

[AArch64] Use SVE FABD in conditional arithmetic

This patch extends the FABD 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_abd<SVE_F:mode>_2)
	(*aarch64_cond_abd<SVE_F:mode>_3)
	(*aarch64_cond_abd<SVE_F:mode>_any): New patterns.

gcc/testsuite/
	* gcc.target/aarch64/sve/cond_fabd_1.c: New test.
	* gcc.target/aarch64/sve/cond_fabd_1_run.c: Likewise.
	* gcc.target/aarch64/sve/cond_fabd_2.c: Likewise.
	* gcc.target/aarch64/sve/cond_fabd_2_run.c: Likewise.
	* gcc.target/aarch64/sve/cond_fabd_3.c: Likewise.
	* gcc.target/aarch64/sve/cond_fabd_3_run.c: Likewise.
	* gcc.target/aarch64/sve/cond_fabd_4.c: Likewise.
	* gcc.target/aarch64/sve/cond_fabd_4_run.c: Likewise.
	* gcc.target/aarch64/sve/cond_fabd_5.c: Likewise.
	* gcc.target/aarch64/sve/cond_fabd_5_run.c: Likewise.

Co-Authored-By: Kugan Vivekanandarajah <kuganv@linaro.org>
From-SVN: r274507