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

src/compiler/node.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/compiler/node.h"
 
 #include <algorithm>
 
 namespace v8 {
 namespace internal {
@@ skipping 116 matching lines @@
   }
   return use->from;
 }
 
 
 void Node::ReplaceUses(Node* replace_to) {
   for (Use* use = first_use_; use; use = use->next) {
     use->from->GetInputRecordPtr(use->input_index)->to = replace_to;
   }
   if (!replace_to->last_use_) {
-    DCHECK(!replace_to->first_use_);
+    DCHECK_EQ(nullptr, replace_to->first_use_);
     replace_to->first_use_ = first_use_;
     replace_to->last_use_ = last_use_;
   } else if (first_use_) {
     DCHECK_NOT_NULL(replace_to->first_use_);
     replace_to->last_use_->next = first_use_;
     first_use_->prev = replace_to->last_use_;
     replace_to->last_use_ = last_use_;
   }
   first_use_ = nullptr;
   last_use_ = nullptr;
@@ skipping 119 matching lines @@
   ++(*this);
   return result;
 }
 
 
 bool Node::Uses::empty() const { return begin() == end(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8