(mulhisi3, umulhisi3 matchers): Restrict range of constants allowed.

From-SVN: r4397

gcc/config/m68k/m68k.md

@@ -2403,7 +2403,7 @@
 	(mult:SI (sign_extend:SI
 		  (match_operand:HI 1 "nonimmediate_operand" "%0"))
 		 (match_operand:SI 2 "const_int_operand" "n")))]
-  "INTVAL (operands[2]) >= -0x10000 && INTVAL (operands[2]) <= 0x7fff"
+  "INTVAL (operands[2]) >= -0x8000 && INTVAL (operands[2]) <= 0x7fff"
   "*
 {
 #if defined(MOTOROLA) && !defined(CRDS)