[wasm] Int64Lowering of Int64Mul on ia32 and arm.

src/compiler/x87/instruction-selector-x87.cc

Index: src/compiler/x87/instruction-selector-x87.cc
diff --git a/src/compiler/x87/instruction-selector-x87.cc b/src/compiler/x87/instruction-selector-x87.cc
index a1cc44c8f7ad2ed06c27cd9605aa122fdaa953c5..514bf3be0e71421b375e773b7d7e8210f01e76cd 100644
--- a/src/compiler/x87/instruction-selector-x87.cc
+++ b/src/compiler/x87/instruction-selector-x87.cc
@@ -581,6 +581,8 @@ void InstructionSelector::VisitInt32PairSub(Node* node) {
   Emit(kX87SubPair, 2, outputs, 4, inputs, 1, temps);
 }
 
+void InstructionSelector::VisitInt32PairMul(Node* node) { UNIMPLEMENTED(); }
+
 void InstructionSelector::VisitWord32PairShl(Node* node) {
   X87OperandGenerator g(this);