[PATCH, AARCH64] Fix unrecognizable insn issue with vcond against 0.0f

[PATCH, AARCH64] Fix unrecognizable insn issue with vcond against 0.0f

gcc/
	* config/aarch64/aarch64-simd.md (aarch64_vcond_internal): Fix
	floating-point vector comparisons against 0.

gcc/testsuite/
   	* gcc.target/aarch64/vect-fcm.x: Add check for zero forms of
	inverse operands.
	* gcc.target/aarch64/vect-fcm-eq-d.c: Check that new zero form
	loop is vectorized.
   	* gcc.target/aarch64/vect-fcm-eq-f.c: Likewise.
   	* gcc.target/aarch64/vect-fcm-ge-d.c: Check that new zero form
	loop is vectorized and that the correct instruction is generated.
   	* gcc.target/aarch64/vect-fcm-ge-f.c: Likewise.
   	* gcc.target/aarch64/vect-fcm-gt-d.c: Likewise.
   	* gcc.target/aarch64/vect-fcm-gt-f.c: Likewise.

From-SVN: r197741