s390: add new mul support on branches and deopts

R=joransiu@ca.ibm.com, bjaideep@ca.ibm.com
BUG=

Review-Url: https://codereview.chromium.org/2815903002
Cr-Commit-Position: refs/heads/master@{#44628}

src/compiler/s390/instruction-selector-s390.cc

@@ -2050,11 +2050,18 @@ void VisitWordCompareZero(InstructionSelector* selector, Node* user,
                 return VisitWord32BinOp(selector, node, kS390_Sub32,
                                         SubOperandMode, cont);
               case IrOpcode::kInt32MulWithOverflow:
-                cont->OverwriteAndNegateIfEqual(kNotEqual);
-                return VisitWord32BinOp(
-                    selector, node, kS390_Mul32WithOverflow,
-                    OperandMode::kInt32Imm | OperandMode::kAllowDistinctOps,
-                    cont);
+                if (CpuFeatures::IsSupported(MISC_INSTR_EXT2)) {
+                  cont->OverwriteAndNegateIfEqual(kOverflow);
+                  return VisitWord32BinOp(
+                      selector, node, kS390_Mul32,
+                      OperandMode::kAllowRRR | OperandMode::kAllowRM, cont);
+                } else {
+                  cont->OverwriteAndNegateIfEqual(kNotEqual);
+                  return VisitWord32BinOp(
+                      selector, node, kS390_Mul32WithOverflow,
+                      OperandMode::kInt32Imm | OperandMode::kAllowDistinctOps,
+                      cont);
+                }
               case IrOpcode::kInt32AbsWithOverflow:
                 cont->OverwriteAndNegateIfEqual(kOverflow);
                 return VisitWord32UnaryOp(selector, node, kS390_Abs32,