[turbofan] Simplified splintering code.

src/compiler/live-range-separator.h

 // 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.
 
 #ifndef V8_LIVE_RANGE_SEPARATOR_H_
 #define V8_LIVE_RANGE_SEPARATOR_H_
 
 
 #include <src/zone.h>
 namespace v8 {
@@ skipping 29 matching lines @@
  public:
   LiveRangeMerger(RegisterAllocationData* data, Zone* zone)
       : data_(data), zone_(zone) {}
 
   void Merge();
 
  private:
   RegisterAllocationData* data() const { return data_; }
   Zone* zone() const { return zone_; }
 
+  // Mark ranges spilled in deferred blocks, that also cover non-deferred code.
+  // We do nothing special for ranges fully contained in deferred blocks,
+  // because they would "spill in deferred blocks" anyway.
+  void MarkRangesSpilledInDeferredBlocks();
+
   RegisterAllocationData* const data_;
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(LiveRangeMerger);
 };
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_LIVE_RANGE_SEPARATOR_H_