ARM64: Change some incorect uses of ptrdiff_t to int64_t.

src/arm64/assembler-arm64-inl.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.
 
 #ifndef V8_ARM64_ASSEMBLER_ARM64_INL_H_
 #define V8_ARM64_ASSEMBLER_ARM64_INL_H_
 
 #include "src/arm64/assembler-arm64.h"
 #include "src/assembler.h"
 #include "src/debug.h"
@@ skipping 439 matching lines @@
   return Operand(smi);
 }
 
 
 MemOperand::MemOperand()
   : base_(NoReg), regoffset_(NoReg), offset_(0), addrmode_(Offset),
     shift_(NO_SHIFT), extend_(NO_EXTEND), shift_amount_(0) {
 }
 
 
-MemOperand::MemOperand(Register base, ptrdiff_t offset, AddrMode addrmode)
+MemOperand::MemOperand(Register base, int64_t offset, AddrMode addrmode)
   : base_(base), regoffset_(NoReg), offset_(offset), addrmode_(addrmode),
     shift_(NO_SHIFT), extend_(NO_EXTEND), shift_amount_(0) {
   DCHECK(base.Is64Bits() && !base.IsZero());
 }
 
 
 MemOperand::MemOperand(Register base,
                        Register regoffset,
                        Extend extend,
                        unsigned shift_amount)
@@ skipping 792 matching lines @@
 
 
 void Assembler::ClearRecordedAstId() {
   recorded_ast_id_ = TypeFeedbackId::None();
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM64_ASSEMBLER_ARM64_INL_H_