s390x: fix mul operation

Change-Id: I8cdf2d79d0b0340c924360bf25e3ce0167ed8ee4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2595724Reviewed-by: Milad Fa <mfarazma@redhat.com>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/master@{#71848}

src/codegen/s390/macro-assembler-s390.cc

@@ -2591,13 +2591,7 @@ void TurboAssembler::MulS64(Register dst, const Operand& opnd) {
 void TurboAssembler::MulS64(Register dst, Register src) { msgr(dst, src); }
 
 void TurboAssembler::MulS64(Register dst, const MemOperand& opnd) {
-  if (is_uint16(opnd.offset())) {
-    ms(dst, opnd);
-  } else if (is_int20(opnd.offset())) {
-    msy(dst, opnd);
-  } else {
-    UNIMPLEMENTED();
-  }
+  msg(dst, opnd);
 }
 
 void TurboAssembler::Sqrt(DoubleRegister result, DoubleRegister input) {