[wasm] Reuse constrained input for same vreg

src/compiler/ia32/code-generator-ia32.cc

Index: src/compiler/ia32/code-generator-ia32.cc
diff --git a/src/compiler/ia32/code-generator-ia32.cc b/src/compiler/ia32/code-generator-ia32.cc
index 369699067e2b8b9d8dc65ad5e9b322be0dfc9ff3..e3efb6ea76b1732f03d72570f94cc85db765b57b 100644
--- a/src/compiler/ia32/code-generator-ia32.cc
+++ b/src/compiler/ia32/code-generator-ia32.cc
@@ -1280,15 +1280,9 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       }
       break;
     }
-    case kIA32MulPair: {
-      __ imul(i.OutputRegister(1), i.InputOperand(0));
-      __ mov(i.TempRegister(0), i.InputOperand(1));
-      __ imul(i.TempRegister(0), i.InputOperand(2));
-      __ add(i.OutputRegister(1), i.TempRegister(0));
-      __ mov(i.OutputRegister(0), i.InputOperand(0));
-      // Multiplies the low words and stores them in eax and edx.
-      __ mul(i.InputRegister(2));
-      __ add(i.OutputRegister(1), i.TempRegister(0));
+    case kIA32Umul: {
+      __ mov(i.OutputRegister(0), i.InputRegister(0));
+      __ mul(i.InputRegister(1));
 
       break;
     }