[turbofan] Build s/NULL/nullptr/g and CHECK(x != nullptr) to CHECK_NOT_NULL(x).

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 712 matching lines @@
   AddressingMode addressing_mode() const {
     return AddressingModeField::decode(opcode());
   }
   FlagsMode flags_mode() const { return FlagsModeField::decode(opcode()); }
   FlagsCondition flags_condition() const {
     return FlagsConditionField::decode(opcode());
   }
 
   // TODO(titzer): make call into a flags.
   static Instruction* New(Zone* zone, InstructionCode opcode) {
-    return New(zone, opcode, 0, NULL, 0, NULL, 0, NULL);
+    return New(zone, opcode, 0, nullptr, 0, nullptr, 0, nullptr);
   }
 
   static Instruction* New(Zone* zone, InstructionCode opcode,
                           size_t output_count, InstructionOperand* outputs,
                           size_t input_count, InstructionOperand* inputs,
                           size_t temp_count, InstructionOperand* temps) {
     DCHECK(opcode >= 0);
-    DCHECK(output_count == 0 || outputs != NULL);
-    DCHECK(input_count == 0 || inputs != NULL);
-    DCHECK(temp_count == 0 || temps != NULL);
+    DCHECK(output_count == 0 || outputs != nullptr);
+    DCHECK(input_count == 0 || inputs != nullptr);
+    DCHECK(temp_count == 0 || temps != nullptr);
     size_t total_extra_ops = output_count + input_count + temp_count;
     if (total_extra_ops != 0) total_extra_ops--;
     int size = static_cast<int>(
         RoundUp(sizeof(Instruction), sizeof(InstructionOperand)) +
         total_extra_ops * sizeof(InstructionOperand));
     return new (zone->New(size)) Instruction(
         opcode, output_count, outputs, input_count, inputs, temp_count, temps);
   }
 
   Instruction* MarkAsCall() {
     bit_field_ = IsCallField::update(bit_field_, true);
     return this;
   }
   bool IsCall() const { return IsCallField::decode(bit_field_); }
   bool NeedsReferenceMap() const { return IsCall(); }
-  bool HasReferenceMap() const { return reference_map_ != NULL; }
+  bool HasReferenceMap() const { return reference_map_ != nullptr; }
 
   bool ClobbersRegisters() const { return IsCall(); }
   bool ClobbersTemps() const { return IsCall(); }
   bool ClobbersDoubleRegisters() const { return IsCall(); }
   ReferenceMap* reference_map() const { return reference_map_; }
 
   void set_reference_map(ReferenceMap* map) {
     DCHECK(NeedsReferenceMap());
     DCHECK(!reference_map_);
     reference_map_ = map;
   }
 
   void OverwriteWithNop() {
     opcode_ = ArchOpcodeField::encode(kArchNop);
     bit_field_ = 0;
-    reference_map_ = NULL;
+    reference_map_ = nullptr;
   }
 
   bool IsNop() const {
     return arch_opcode() == kArchNop && InputCount() == 0 &&
            OutputCount() == 0 && TempCount() == 0;
   }
 
   enum GapPosition {
     START,
     END,
@@ skipping 563 matching lines @@
 
 
 std::ostream& operator<<(std::ostream& os,
                          const PrintableInstructionSequence& code);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INSTRUCTION_H_