[turbofan] Unit tests for live range conflicts.

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/zone-containers.h"
@@ skipping 122 matching lines @@
   }
 
   static inline LifetimePosition Invalid() { return LifetimePosition(); }
 
   static inline LifetimePosition MaxPosition() {
     // We have to use this kind of getter instead of static member due to
     // crash bug in GDB.
     return LifetimePosition(kMaxInt);
   }
 
+  static inline LifetimePosition FromInt(int value) {
+    return LifetimePosition(value);
+  }
+
  private:
   static const int kHalfStep = 2;
   static const int kStep = 2 * kHalfStep;
 
   // Code relies on kStep and kHalfStep being a power of two.
   STATIC_ASSERT(IS_POWER_OF_TWO(kHalfStep));
 
   explicit LifetimePosition(int value) : value_(value) {}
 
   int value_;
@@ skipping 783 matching lines @@
   RegisterAllocationData* const data_;
 
   DISALLOW_COPY_AND_ASSIGN(LiveRangeConnector);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_REGISTER_ALLOCATOR_H_