[arm64] Fix some signed/unsigned type inconsistencies.

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/debug.h"
@@ skipping 23 matching lines @@
   Assembler::set_target_address_at(pc_, host_, target, icache_flush_mode);
   if (write_barrier_mode == UPDATE_WRITE_BARRIER && host() != NULL &&
       IsCodeTarget(rmode_)) {
     Object* target_code = Code::GetCodeFromTargetAddress(target);
     host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(
         host(), this, HeapObject::cast(target_code));
   }
 }
 
 
-inline unsigned CPURegister::code() const {
+inline int CPURegister::code() const {
   DCHECK(IsValid());
   return reg_code;
 }
 
 
 inline CPURegister::RegisterType CPURegister::type() const {
   DCHECK(IsValidOrNone());
   return reg_type;
 }
 
 
 inline RegList CPURegister::Bit() const {
-  DCHECK(reg_code < (sizeof(RegList) * kBitsPerByte));
+  DCHECK(static_cast<size_t>(reg_code) < (sizeof(RegList) * kBitsPerByte));
   return IsValid() ? 1UL << reg_code : 0;
 }
 
 
-inline unsigned CPURegister::SizeInBits() const {
+inline int CPURegister::SizeInBits() const {
   DCHECK(IsValid());
   return reg_size;
 }
 
 
 inline int CPURegister::SizeInBytes() const {
   DCHECK(IsValid());
   DCHECK(SizeInBits() % 8 == 0);
   return reg_size / 8;
 }
@@ skipping 1183 matching lines @@
 
 void Assembler::ClearRecordedAstId() {
   recorded_ast_id_ = TypeFeedbackId::None();
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ARM64_ASSEMBLER_ARM64_INL_H_