[wasm] Int64Lowering of I64Shl on ia32.

src/compiler/ia32/instruction-selector-ia32.cc

Index: src/compiler/ia32/instruction-selector-ia32.cc
diff --git a/src/compiler/ia32/instruction-selector-ia32.cc b/src/compiler/ia32/instruction-selector-ia32.cc
index fcb94bd963b4b72068d18d7cec29a2fb21c7eb27..c2e2174f8fa6bde0529e39977bd76557b76134bc 100644
--- a/src/compiler/ia32/instruction-selector-ia32.cc
+++ b/src/compiler/ia32/instruction-selector-ia32.cc
@@ -585,6 +585,26 @@ void InstructionSelector::VisitWord32Sar(Node* node) {
   VisitShift(this, node, kIA32Sar);
 }
 
+void InstructionSelector::VisitWord32PairShl(Node* node) {
+  IA32OperandGenerator g(this);
+
+  Node* shift = node->InputAt(2);
+  InstructionOperand shift_operand;
+  if (g.CanBeImmediate(shift)) {
+    shift_operand = g.UseImmediate(shift);
+  } else {
+    shift_operand = g.UseFixed(shift, ecx);
+  }
+  InstructionOperand inputs[] = {g.UseFixed(node->InputAt(0), eax),
+                                 g.UseFixed(node->InputAt(1), edx),
+                                 shift_operand};
+
+  InstructionOperand outputs[] = {
+      g.DefineAsFixed(node, eax),
+      g.DefineAsFixed(NodeProperties::FindProjection(node, 1), edx)};
+
+  Emit(kIA32PairShl, 2, outputs, 3, inputs);
+}
 
 void InstructionSelector::VisitWord32Ror(Node* node) {
   VisitShift(this, node, kIA32Ror);