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

src/compiler/js-graph.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/code-stubs.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/typer.h"
 
 namespace v8 {
@@ skipping 102 matching lines @@
 
 Node* JSGraph::Constant(int32_t value) {
   if (value == 0) return ZeroConstant();
   if (value == 1) return OneConstant();
   return NumberConstant(value);
 }
 
 
 Node* JSGraph::Int32Constant(int32_t value) {
   Node** loc = cache_.FindInt32Constant(value);
-  if (*loc == NULL) {
+  if (*loc == nullptr) {
     *loc = graph()->NewNode(common()->Int32Constant(value));
   }
   return *loc;
 }
 
 
 Node* JSGraph::Int64Constant(int64_t value) {
   Node** loc = cache_.FindInt64Constant(value);
-  if (*loc == NULL) {
+  if (*loc == nullptr) {
     *loc = graph()->NewNode(common()->Int64Constant(value));
   }
   return *loc;
 }
 
 
 Node* JSGraph::NumberConstant(double value) {
   Node** loc = cache_.FindNumberConstant(value);
-  if (*loc == NULL) {
+  if (*loc == nullptr) {
     *loc = graph()->NewNode(common()->NumberConstant(value));
   }
   return *loc;
 }
 
 
 Node* JSGraph::Float32Constant(float value) {
   Node** loc = cache_.FindFloat32Constant(value);
-  if (*loc == NULL) {
+  if (*loc == nullptr) {
     *loc = graph()->NewNode(common()->Float32Constant(value));
   }
   return *loc;
 }
 
 
 Node* JSGraph::Float64Constant(double value) {
   Node** loc = cache_.FindFloat64Constant(value);
-  if (*loc == NULL) {
+  if (*loc == nullptr) {
     *loc = graph()->NewNode(common()->Float64Constant(value));
   }
   return *loc;
 }
 
 
 Node* JSGraph::ExternalConstant(ExternalReference reference) {
   Node** loc = cache_.FindExternalConstant(reference);
-  if (*loc == NULL) {
+  if (*loc == nullptr) {
     *loc = graph()->NewNode(common()->ExternalConstant(reference));
   }
   return *loc;
 }
 
 
 Node* JSGraph::ExternalConstant(Runtime::FunctionId function_id) {
   return ExternalConstant(ExternalReference(function_id, isolate()));
 }
 
@@ skipping 23 matching lines @@
   for (size_t i = 0; i < arraysize(cached_nodes_); i++) {
     if (Node* node = cached_nodes_[i]) {
       if (!node->IsDead()) nodes->push_back(node);
     }
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8