Revert "Make GCC happy again." and "Initial switch to Chromium-style CHECK_* and DCHECK_* macros.".

src/compiler/register-allocator.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/compiler/linkage.h"
 #include "src/compiler/register-allocator.h"
 #include "src/string-stream.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 165 matching lines @@
 void LiveRange::SetSpillOperand(InstructionOperand* operand) {
   DCHECK(HasNoSpillType());
   DCHECK(!operand->IsUnallocated());
   spill_type_ = SpillType::kSpillOperand;
   spill_operand_ = operand;
 }
 
 
 void LiveRange::SetSpillRange(SpillRange* spill_range) {
   DCHECK(HasNoSpillType() || HasSpillRange());
-  DCHECK(spill_range);
+  DCHECK_NE(spill_range, nullptr);
   spill_type_ = SpillType::kSpillRange;
   spill_range_ = spill_range;
 }
 
 
 void LiveRange::CommitSpillOperand(InstructionOperand* operand) {
   DCHECK(HasSpillRange());
   DCHECK(!operand->IsUnallocated());
   DCHECK(!IsChild());
   spill_type_ = SpillType::kSpillOperand;
@@ skipping 2278 matching lines @@
   } else {
     DCHECK(range->Kind() == GENERAL_REGISTERS);
     assigned_registers_->Add(reg);
   }
   range->set_assigned_register(reg, code_zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8