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libc/arm64: memmove/memset - save/restore link register

--- a/sys/src/libc/arm64/memmove.s

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

@@ -1,5 +1,5 @@

 TEXT memcpy(SB), 1, $-4

-TEXT memmove(SB), $-4

+TEXT memmove(SB), $0

 	MOV	from+8(FP), R1

 	MOV	n+16(FP), R2

--- a/sys/src/libc/arm64/memset.s

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

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

-TEXT memset(SB), $-4

+TEXT memset(SB), $0

 	MOVBU	c+8(FP), R1

 	MOV	n+16(FP), R2