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Plan 9 asm swaps the order of CMP args.

	Reverse vs fwd copies makes a difference. oops.

--- a/lib/std/memops-impl+plan9-x64.s

+++ b/lib/std/memops-impl+plan9-x64.s

@@ -3,12 +3,12 @@

 std.memfill	: (dst : byte#, val : byte, len : std.size -> void)

 */

 TEXT std$memblit+0(SB),$0

-	CMPQ	DI,SI

+	CMPQ	SI,DI

 	JZ	.done

 	JG	.fwdcpy

 	MOVQ	SI,AX

 	SUBQ	DI,AX

-	CMPQ	AX,CX

+	CMPQ	CX,AX

 	JG	.revcpy

 .fwdcpy:

 	MOVQ	DX,CX