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

src/compiler/ast-loop-assignment-analyzer.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/ast-loop-assignment-analyzer.h"
 #include "src/compiler.h"
 #include "src/parsing/parser.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 typedef class AstLoopAssignmentAnalyzer ALAA;  // for code shortitude.
 
 ALAA::AstLoopAssignmentAnalyzer(Zone* zone, CompilationInfo* info)
     : info_(info), zone_(zone), loop_stack_(zone) {
   InitializeAstVisitor(info->isolate());
 }
 
 
 LoopAssignmentAnalysis* ALAA::Analyze() {
   LoopAssignmentAnalysis* a = new (zone_) LoopAssignmentAnalysis(zone_);
   result_ = a;
   VisitStatements(info()->literal()->body());
-  result_ = NULL;
+  result_ = nullptr;
   return a;
 }
 
 
 void ALAA::Enter(IterationStatement* loop) {
   int num_variables = 1 + info()->scope()->num_parameters() +
                       info()->scope()->num_stack_slots();
   BitVector* bits = new (zone_) BitVector(num_variables, zone_);
   if (info()->is_osr() && info()->osr_ast_id() == loop->OsrEntryId())
     bits->AddAll();
@@ skipping 278 matching lines @@
   int count = 0;
   int var_index = AstLoopAssignmentAnalyzer::GetVariableIndex(scope, var);
   for (size_t i = 0; i < list_.size(); i++) {
     if (list_[i].second->Contains(var_index)) count++;
   }
   return count;
 }
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8