[aarch64]: add support for fabd in sve
This patch adds support in SVE to combine: - fsub and fabs into fabd fsub z0.s, z0.s, z1.s fabs z0.s, p1/m, z0.s --- fabd z0.s, p1/m, z0.s, z1.s 2019-05-30 Sylvia Taylor <sylvia.taylor@arm.com> gcc/ * config/aarch64/aarch64-sve.md (*fabd<mode>3): New. gcc/testsuite/ * gcc.target/aarch64/sve/fabd_1.c: New. From-SVN: r271785
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