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

src/compiler/loop-peeling.cc

 // Copyright 2015 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/common-operator.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/loop-peeling.h"
 #include "src/compiler/node.h"
 #include "src/compiler/node-marker.h"
 #include "src/compiler/node-properties.h"
@@ skipping 250 matching lines @@
             end = found;
           } else {
             CHECK_EQ(end, found);  // it should be unique!
           }
         } else if (use->opcode() == IrOpcode::kReturn) {
           found = use;
           rets.push_back(found);
         }
       }
       // There should be a merge or a return for each exit.
-      CHECK(found);
+      CHECK_NE(NULL, found);
     }
     // Return nodes, the end merge, and the phis associated with the end merge
     // must be duplicated as well.
     for (Node* node : rets) exits.push_back(node);
     if (end != NULL) {
       exits.push_back(end);
       for (Node* use : end->uses()) {
         if (NodeProperties::IsPhi(use)) exits.push_back(use);
       }
     }
@@ skipping 48 matching lines @@
       }
     }
   }
 
   return iter;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8