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7l: fix MADD/MSUB optional reg

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

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

@@ -148,6 +148,7 @@

 	{ AMUL,		C_REG,	C_REG,	C_REG,		15, 4, 0 },

 	{ AMUL,		C_REG,	C_NONE,	C_REG,		15, 4, 0 },

 	{ AMADD,		C_REG,	C_REG,	C_REG,		15, 4, 0 },

+	{ AMADD,		C_REG,	C_NONE,	C_REG,		15, 4, 0 },

 	{ AREM,		C_REG,	C_REG,	C_REG,		16, 8, 0 },

 	{ AREM,		C_REG,	C_NONE,	C_REG,		16, 8, 0 },