[turbofan] Implemented the ChangeFloat64ToInt64 TurboFan operator.

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 db953c2e42cfe1b8efda3dbcf7e329fa5b966d28..48da9a3d8e0ba5107cdcb36ef587e82e67b7511c 100644
--- a/src/compiler/instruction-selector.cc
+++ b/src/compiler/instruction-selector.cc
@@ -814,6 +814,8 @@ void InstructionSelector::VisitNode(Node* node) {
       return MarkAsWord32(node), VisitChangeFloat64ToInt32(node);
     case IrOpcode::kChangeFloat64ToUint32:
       return MarkAsWord32(node), VisitChangeFloat64ToUint32(node);
+    case IrOpcode::kChangeFloat64ToInt64:
+      return MarkAsWord64(node), VisitChangeFloat64ToInt64(node);
     case IrOpcode::kChangeInt32ToInt64:
       return MarkAsWord64(node), VisitChangeInt32ToInt64(node);
     case IrOpcode::kChangeUint32ToUint64:
@@ -1054,6 +1056,11 @@ void InstructionSelector::VisitChangeUint32ToUint64(Node* node) {
 }
 
 
+void InstructionSelector::VisitChangeFloat64ToInt64(Node* node) {
+  UNIMPLEMENTED();
+}
+
+
 void InstructionSelector::VisitTruncateInt64ToInt32(Node* node) {
   UNIMPLEMENTED();
 }