Remove frame pointer from StackHandler.

src/arm64/frames-arm64.h

 // Copyright 2013 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/arm64/assembler-arm64.h"
 #include "src/arm64/constants-arm64.h"
 
 #ifndef V8_ARM64_FRAMES_ARM64_H_
 #define V8_ARM64_FRAMES_ARM64_H_
 
@@ skipping 81 matching lines @@
   static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
 };
 
 
 inline Object* JavaScriptFrame::function_slot_object() const {
   const int offset = JavaScriptFrameConstants::kFunctionOffset;
   return Memory::Object_at(fp() + offset);
 }
 
 
-inline void StackHandler::SetFp(Address slot, Address fp) {
-  Memory::Address_at(slot) = fp;
-}
-
-
 } }  // namespace v8::internal
 
 #endif  // V8_ARM64_FRAMES_ARM64_H_