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5a: reject MOVM instruction with .S and .W bits both set (aijus idea)

--- a/sys/src/cmd/5a/lex.c

+++ b/sys/src/cmd/5a/lex.c

@@ -563,6 +563,13 @@

 		scond = (scond & ~0xf) | Always;

 	}

+	if(a == AMOVM){

+		if((scond & (C_SBIT|C_WBIT)) == (C_SBIT|C_WBIT)){

+			yyerror("MOVM .S and .W are exclusive");

+			errorexit();

+		}

+	}

+

 	if(pass == 1)

 		goto out;

 jackpot: