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7l: allow byte/halfword register offset load/store

--- a/sys/src/cmd/7l/optab.c

+++ b/sys/src/cmd/7l/optab.c

@@ -161,6 +161,9 @@

 	{ AMOV,		C_ROFF,	C_NONE,	C_REG,	68, 4, 0 },

 	{ AMOVW,	C_ROFF,	C_NONE,	C_REG,	68, 4, 0 },

+	{ AMOVH,	C_ROFF,	C_NONE,	C_REG,	68, 4, 0 },

+	{ AMOVB,	C_ROFF,	C_NONE,	C_REG,	68, 4, 0 },

+	{ AMOVBU,	C_ROFF,	C_NONE,	C_REG,	68, 4, 0 },

 	{ AFMOVS,	C_ROFF,	C_NONE,	C_FREG,	68, 4, 0 },

 	{ AFMOVD,	C_ROFF,	C_NONE,	C_FREG,	68, 4, 0 },

@@ -168,6 +171,9 @@

 	{ AMOV,		C_REG,	C_NONE,	C_ROFF,	69, 4, 0 },

 	{ AMOVW,	C_REG,	C_NONE,	C_ROFF,	69, 4, 0 },

+	{ AMOVH,	C_REG,	C_NONE,	C_ROFF,	69, 4, 0 },

+	{ AMOVB,	C_REG,	C_NONE,	C_ROFF,	69, 4, 0 },

+	{ AMOVBU,	C_REG,	C_NONE,	C_ROFF,	69, 4, 0 },

 	{ AFMOVS,	C_FREG,	C_NONE,	C_ROFF,	69, 4, 0 },

 	{ AFMOVD,	C_FREG,	C_NONE,	C_ROFF,	69, 4, 0 },