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

src/compiler/instruction.h

 // 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.
 
 #ifndef V8_COMPILER_INSTRUCTION_H_
 #define V8_COMPILER_INSTRUCTION_H_
 
 #include <deque>
 #include <iosfwd>
 #include <map>
@@ skipping 502 matching lines @@
     return opcode() == kSourcePositionInstruction;
   }
 
   bool ClobbersRegisters() const { return IsCall(); }
   bool ClobbersTemps() const { return IsCall(); }
   bool ClobbersDoubleRegisters() const { return IsCall(); }
   PointerMap* pointer_map() const { return pointer_map_; }
 
   void set_pointer_map(PointerMap* map) {
     DCHECK(NeedsPointerMap());
-    DCHECK(!pointer_map_);
+    DCHECK_EQ(NULL, pointer_map_);
     pointer_map_ = map;
   }
 
   // Placement new operator so that we can smash instructions into
   // zone-allocated memory.
   void* operator new(size_t, void* location) { return location; }
 
   void operator delete(void* pointer, void* location) { UNREACHABLE(); }
 
   void OverwriteWithNop() {
@@ skipping 521 matching lines @@
 
 
 std::ostream& operator<<(std::ostream& os,
                          const PrintableInstructionSequence& code);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INSTRUCTION_H_