[turbofan] Implemented the ChangeFloat64ToInt64 TurboFan operator.

src/compiler/raw-machine-assembler.h

Index: src/compiler/raw-machine-assembler.h
diff --git a/src/compiler/raw-machine-assembler.h b/src/compiler/raw-machine-assembler.h
index 451dbf4f37f8d4fe6df287ba1eea9efc64917964..a4391fef033d99b8880d9371054df42c2d64f5df 100644
--- a/src/compiler/raw-machine-assembler.h
+++ b/src/compiler/raw-machine-assembler.h
@@ -443,6 +443,9 @@ class RawMachineAssembler {
   Node* ChangeFloat64ToUint32(Node* a) {
     return AddNode(machine()->ChangeFloat64ToUint32(), a);
   }
+  Node* ChangeFloat64ToInt64(Node* a) {
+    return AddNode(machine()->ChangeFloat64ToInt64(), a);
+  }
   Node* ChangeInt32ToInt64(Node* a) {
     return AddNode(machine()->ChangeInt32ToInt64(), a);
   }