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libmach: add HSUBPD decoding for amd64

reference: https://www.felixcloutier.com/x86/hsubpd

--- a/sys/src/libmach/8db.c

+++ b/sys/src/libmach/8db.c

@@ -423,6 +423,7 @@

 [0x71]	RMOP,0,		optab660F71,

 [0x72]	RMOP,0,		optab660F72,

 [0x73]	RMOP,0,		optab660F73,

+[0x7D]	RM,0,		"HSUBPD	%x,%X",

 [0x7E]	RM,0,		"MOV%S	%X,%e",

 [0x7F]	RM,0,		"MOVO	%X,%x",

 [0xC4]	RM,Ib,		"PINSRW	%i,%e,%X",