[wasm] Int64Lowering of Int64Add 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 e9d7c093db5c48c79e796d860b2e7d1d3b7c7ff0..7d6f762f1c4ed05076547e6ac7daa339ce65ee8f 100644
--- a/src/compiler/x87/instruction-selector-x87.cc
+++ b/src/compiler/x87/instruction-selector-x87.cc
@@ -544,6 +544,8 @@ void InstructionSelector::VisitWord32Sar(Node* node) {
   VisitShift(this, node, kX87Sar);
 }
 
+void InstructionSelector::VisitInt32PairAdd(Node* node) { UNIMPLEMENTED(); }
+
 void InstructionSelector::VisitWord32PairShl(Node* node) {
   X87OperandGenerator g(this);