[turbofan] Implemented the ChangeFloat64ToInt64 TurboFan operator.

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

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 #include "src/ppc/frames-ppc.h"
 
@@ skipping 909 matching lines @@
   VisitRR(this, kPPC_DoubleToInt32, node);
 }
 
 
 void InstructionSelector::VisitChangeFloat64ToUint32(Node* node) {
   VisitRR(this, kPPC_DoubleToUint32, node);
 }
 
 
 #if V8_TARGET_ARCH_PPC64
+void InstructionSelector::VisitChangeFloat64ToInt64(Node* node) {
+  VisitRR(this, kPPC_DoubleToInt64, node);
+}
+
+
 void InstructionSelector::VisitChangeInt32ToInt64(Node* node) {
   // TODO(mbrandy): inspect input to see if nop is appropriate.
   VisitRR(this, kPPC_ExtendSignWord32, node);
 }
 
 
 void InstructionSelector::VisitChangeUint32ToUint64(Node* node) {
   // TODO(mbrandy): inspect input to see if nop is appropriate.
   VisitRR(this, kPPC_Uint32ToUint64, node);
 }
@@ skipping 712 matching lines @@
          MachineOperatorBuilder::kFloat64RoundTruncate |
          MachineOperatorBuilder::kFloat64RoundTiesAway |
          MachineOperatorBuilder::kWord32Popcnt |
          MachineOperatorBuilder::kWord64Popcnt;
   // We omit kWord32ShiftIsSafe as s[rl]w use 0x3f as a mask rather than 0x1f.
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8