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

src/compiler/move-optimizer.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/move-optimizer.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
@@ skipping 237 matching lines @@
   }
   if (move_map.empty() || correct_counts != move_map.size()) return;
   // Find insertion point.
   Instruction* instr = nullptr;
   for (int i = block->first_instruction_index();
        i <= block->last_instruction_index(); ++i) {
     instr = code()->instructions()[i];
     if (!GapsCanMoveOver(instr, local_zone()) || !instr->AreMovesRedundant())
       break;
   }
-  DCHECK(instr != nullptr);
+  DCHECK_NOT_NULL(instr);
   bool gap_initialized = true;
   if (instr->parallel_moves()[0] == nullptr ||
       instr->parallel_moves()[0]->empty()) {
     to_finalize_.push_back(instr);
   } else {
     // Will compress after insertion.
     gap_initialized = false;
     std::swap(instr->parallel_moves()[0], instr->parallel_moves()[1]);
   }
   ParallelMove* moves = instr->GetOrCreateParallelMove(
@@ skipping 73 matching lines @@
         static_cast<Instruction::GapPosition>(1), code_zone());
     slot_1->AddMove(group_begin->destination(), load->destination());
     load->Eliminate();
   }
   loads.clear();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8