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6l: support MOV to/from DR[1-3]

--- a/sys/src/cmd/6l/span.c

+++ b/sys/src/cmd/6l/span.c

@@ -885,16 +885,28 @@

 /* mov dr */

 	{AMOVL,	Ydr0,	Yml,	3,	0x0f,0x21,0,0},

+	{AMOVL,	Ydr1,	Yml,	3,	0x0f,0x21,1,0},

+	{AMOVL,	Ydr2,	Yml,	3,	0x0f,0x21,2,0},

+	{AMOVL,	Ydr3,	Yml,	3,	0x0f,0x21,3,0},

 	{AMOVL,	Ydr6,	Yml,	3,	0x0f,0x21,6,0},

 	{AMOVL,	Ydr7,	Yml,	3,	0x0f,0x21,7,0},

 	{AMOVQ,	Ydr0,	Yml,	3,	0x0f,0x21,0,0},

+	{AMOVQ,	Ydr1,	Yml,	3,	0x0f,0x21,1,0},

+	{AMOVQ,	Ydr2,	Yml,	3,	0x0f,0x21,2,0},

+	{AMOVQ,	Ydr3,	Yml,	3,	0x0f,0x21,3,0},

 	{AMOVQ,	Ydr6,	Yml,	3,	0x0f,0x21,6,0},

 	{AMOVQ,	Ydr7,	Yml,	3,	0x0f,0x21,7,0},

 	{AMOVL,	Yml,	Ydr0,	4,	0x0f,0x23,0,0},

+	{AMOVL,	Yml,	Ydr1,	4,	0x0f,0x23,1,0},

+	{AMOVL,	Yml,	Ydr2,	4,	0x0f,0x23,2,0},

+	{AMOVL,	Yml,	Ydr3,	4,	0x0f,0x23,3,0},

 	{AMOVL,	Yml,	Ydr6,	4,	0x0f,0x23,6,0},

 	{AMOVL,	Yml,	Ydr7,	4,	0x0f,0x23,7,0},

 	{AMOVQ,	Yml,	Ydr0,	4,	0x0f,0x23,0,0},

+	{AMOVQ,	Yml,	Ydr1,	4,	0x0f,0x23,1,0},

+	{AMOVQ,	Yml,	Ydr2,	4,	0x0f,0x23,2,0},

+	{AMOVQ,	Yml,	Ydr3,	4,	0x0f,0x23,3,0},

 	{AMOVQ,	Yml,	Ydr6,	4,	0x0f,0x23,6,0},

 	{AMOVQ,	Yml,	Ydr7,	4,	0x0f,0x23,7,0},