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libc/arm64: fabs, floor and ceil in assembly

--- /dev/null

+++ b/sys/src/libc/arm64/fabs.s

@@ -1,0 +1,4 @@

+TEXT	fabs(SB), $0

+	FMOVD	x+0(FP), F0

+	FABSD	F0, F0

+	RETURN

--- /dev/null

+++ b/sys/src/libc/arm64/floor.s

@@ -1,0 +1,9 @@

+TEXT	floor(SB), $0

+	FMOVD	x+0(FP), F0

+	FRINTMD	F0, F0

+	RETURN

+

+TEXT	ceil(SB), $0

+	FMOVD	x+0(FP), F0

+	FRINTPD	F0, F0

+	RETURN

--- a/sys/src/libc/arm64/mkfile

+++ b/sys/src/libc/arm64/mkfile

@@ -7,6 +7,8 @@

 	argv0.s\

 	atom.s\

 	cycles.s\

+	fabs.s\

+	floor.s\

 	getcallerpc.s\

 	getfcr.s\

 	main9.s\