ARM64: Change some incorect uses of ptrdiff_t to int64_t.

src/arm64/instructions-arm64.cc

 // 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/v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #define ARM64_DEFINE_FP_STATICS
 
@@ skipping 164 matching lines @@
   switch (op) {
     case STP_x:
     case LDP_x:
     case STP_d:
     case LDP_d: return LSDoubleWord;
     default: return LSWord;
   }
 }
 
 
-ptrdiff_t Instruction::ImmPCOffset() {
-  ptrdiff_t offset;
+int64_t Instruction::ImmPCOffset() {
+  int64_t offset;
   if (IsPCRelAddressing()) {
     // PC-relative addressing. Only ADR is supported.
     offset = ImmPCRel();
   } else if (BranchType() != UnknownBranchType) {
     // All PC-relative branches.
     // Relative branch offsets are instruction-size-aligned.
     offset = ImmBranch() << kInstructionSizeLog2;
   } else {
     // Load literal (offset from PC).
     DCHECK(IsLdrLiteral());
@@ skipping 111 matching lines @@
   uint64_t payload = ImmMoveWide();
   // TODO(all): If we extend ::InlineData() to support bigger data, we need
   // to update this method too.
   return payload;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64