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

src/compiler/register-allocator.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/base/adapters.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/register-allocator.h"
 #include "src/string-stream.h"
 
 namespace v8 {
@@ skipping 269 matching lines @@
           RepresentationField::encode(rep);
 }
 
 
 void LiveRange::VerifyPositions() const {
   // Walk the positions, verifying that each is in an interval.
   UseInterval* interval = first_interval_;
   for (UsePosition* pos = first_pos_; pos != nullptr; pos = pos->next()) {
     CHECK(Start() <= pos->pos());
     CHECK(pos->pos() <= End());
-    CHECK(interval != nullptr);
+    CHECK_NOT_NULL(interval);
     while (!interval->Contains(pos->pos()) && interval->end() != pos->pos()) {
       interval = interval->next();
-      CHECK(interval != nullptr);
+      CHECK_NOT_NULL(interval);
     }
   }
 }
 
 
 void LiveRange::VerifyIntervals() const {
   DCHECK(first_interval()->start() == Start());
   LifetimePosition last_end = first_interval()->end();
   for (UseInterval* interval = first_interval()->next(); interval != nullptr;
        interval = interval->next()) {
@@ skipping 3179 matching lines @@
     MoveOperands* eliminate = moves->PrepareInsertAfter(move);
     to_insert.push_back(move);
     if (eliminate != nullptr) to_eliminate.push_back(eliminate);
   }
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8