[AArch64] Map fcvt intrinsics to builtin name directly.

[AArch64] Map fcvt intrinsics to builtin name directly.

gcc/
	* config/aarch64/aarch64-builtins.c
	(aarch64_builtin_vectorized_function): Use new names for
	fcvt builtins.
	* config/aarch64/aarch64-simd-builtins.def (fcvtzs): Split as...
	(lbtruncv2sf, lbtruncv4sf, lbtruncv2df): ...This.
	(fcvtzu): Split as...
	(lbtruncuv2sf, lbtruncuv4sf, lbtruncuv2df): ...This.
	(fcvtas): Split as...
	(lroundv2sf, lroundv4sf, lroundv2df, lroundsf, lrounddf): ...This.
	(fcvtau): Split as...
	(lrounduv2sf, lrounduv4sf, lrounduv2df, lroundusf, lroundudf): ...This.
	(fcvtps): Split as...
	(lceilv2sf, lceilv4sf, lceilv2df): ...This.
	(fcvtpu): Split as...
	(lceiluv2sf, lceiluv4sf, lceiluv2df, lceilusf, lceiludf): ...This.
	(fcvtms): Split as...
	(lfloorv2sf, lfloorv4sf, lfloorv2df): ...This.
	(fcvtmu): Split as...
	(lflooruv2sf, lflooruv4sf, lflooruv2df, lfloorusf, lfloorudf): ...This.
	(lfrintnv2sf, lfrintnv4sf, lfrintnv2df, lfrintnsf, lfrintndf): New.
	(lfrintnuv2sf, lfrintnuv4sf, lfrintnuv2df): Likewise.
	(lfrintnusf, lfrintnudf): Likewise.
	* config/aarch64/aarch64-simd.md
	(l<fcvt_pattern><su_optab><fcvt_target><VDQF:mode>2): Convert to
	define_insn.
	(aarch64_fcvt<frint_suffix><su><mode>): Remove.
	* config/aarch64/iterators.md (FCVT): Include UNSPEC_FRINTN.
	(fcvt_pattern): Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@198398 138bc75d-0d04-0410-961f-82ee72b054a4