[turbofan] Support for %_DoubleHi, %_DoubleLo and %_ConstructDouble.

src/compiler/instruction-selector.cc

Index: src/compiler/instruction-selector.cc
diff --git a/src/compiler/instruction-selector.cc b/src/compiler/instruction-selector.cc
index bffe6f76949f47bbaab4f1cdabec14efc917810f..c5d5746b4144285d59dd6fc2b93a97a35381c99f 100644
--- a/src/compiler/instruction-selector.cc
+++ b/src/compiler/instruction-selector.cc
@@ -699,6 +699,10 @@ MachineType InstructionSelector::GetMachineType(Node* node) {
     case IrOpcode::kFloat64LessThan:
     case IrOpcode::kFloat64LessThanOrEqual:
       return kMachBool;
+    case IrOpcode::kFloat64ExtractWord32:
+      return kMachInt32;
+    case IrOpcode::kFloat64InsertWord32:
+      return kMachFloat64;
     default:
       V8_Fatal(__FILE__, __LINE__, "Unexpected operator #%d:%s @ node #%d",
                node->opcode(), node->op()->mnemonic(), node->id());
@@ -903,6 +907,10 @@ void InstructionSelector::VisitNode(Node* node) {
       return MarkAsDouble(node), VisitFloat64RoundTruncate(node);
     case IrOpcode::kFloat64RoundTiesAway:
       return MarkAsDouble(node), VisitFloat64RoundTiesAway(node);
+    case IrOpcode::kFloat64ExtractWord32:
+      return VisitFloat64ExtractWord32(node);
+    case IrOpcode::kFloat64InsertWord32:
+      return MarkAsDouble(node), VisitFloat64InsertWord32(node);
     case IrOpcode::kLoadStackPointer:
       return VisitLoadStackPointer(node);
     case IrOpcode::kCheckedLoad: {