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

src/compiler/coalesced-live-ranges.cc

 // Copyright 2015 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/coalesced-live-ranges.h"
 #include "src/compiler/greedy-allocator.h"
 #include "src/compiler/register-allocator.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 
 LiveRangeConflictIterator::LiveRangeConflictIterator(const LiveRange* range,
                                                      IntervalStore* storage)
     : query_(range->first_interval()),
       pos_(storage->end()),
       intervals_(storage) {
   MovePosAndQueryToFirstConflict();
 }
 
 
 LiveRange* LiveRangeConflictIterator::Current() const {
   if (IsFinished()) return nullptr;
   return pos_->range_;
 }
 
 
 void LiveRangeConflictIterator::MovePosToFirstConflictForQuery() {
-  DCHECK(query_ != nullptr);
+  DCHECK_NOT_NULL(query_);
   auto end = intervals_->end();
   LifetimePosition q_start = query_->start();
   LifetimePosition q_end = query_->end();
 
   if (intervals_->empty() || intervals_->rbegin()->end_ <= q_start ||
       intervals_->begin()->start_ >= q_end) {
     pos_ = end;
     return;
   }
 
@@ skipping 93 matching lines @@
     }
     last_end = i.end_;
   }
   return true;
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8