[turbofan] Alternative splintering mechanism.

src/compiler/register-allocator.h

 // 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.
 
 #ifndef V8_REGISTER_ALLOCATOR_H_
 #define V8_REGISTER_ALLOCATOR_H_
 
 #include "src/compiler/instruction.h"
 #include "src/ostreams.h"
 #include "src/register-configuration.h"
@@ skipping 40 matching lines @@
 
   // Returns the index of the instruction to which this lifetime position
   // corresponds.
   int ToInstructionIndex() const {
     DCHECK(IsValid());
     return value_ / kStep;
   }
 
   // Returns true if this lifetime position corresponds to a START value
   bool IsStart() const { return (value_ & (kHalfStep - 1)) == 0; }
+  // Returns true if this lifetime position corresponds to an END value
+  bool IsEnd() const { return (value_ & (kHalfStep - 1)) == 1; }
   // Returns true if this lifetime position corresponds to a gap START value
   bool IsFullStart() const { return (value_ & (kStep - 1)) == 0; }
 
   bool IsGapPosition() const { return (value_ & 0x2) == 0; }
   bool IsInstructionPosition() const { return !IsGapPosition(); }
 
   // Returns the lifetime position for the current START.
   LifetimePosition Start() const {
     DCHECK(IsValid());
     return LifetimePosition(value_ & ~(kHalfStep - 1));
@@ skipping 1015 matching lines @@
   RegisterAllocationData* const data_;
 
   DISALLOW_COPY_AND_ASSIGN(LiveRangeConnector);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_REGISTER_ALLOCATOR_H_