Revert of [Turbofan] Clean up register allocator and verifier code.

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 981 matching lines @@
   LifetimePosition FindOptimalSplitPos(LifetimePosition start,
                                        LifetimePosition end);
 
   void Spill(LiveRange* range);
 
   // If we are trying to spill a range inside the loop try to
   // hoist spill position out to the point just before the loop.
   LifetimePosition FindOptimalSpillingPos(LiveRange* range,
                                           LifetimePosition pos);
 
-  const char* RegisterName(MachineRepresentation rep, int code) const;
+  const ZoneVector<TopLevelLiveRange*>& GetFixedRegisters() const;
+  const char* RegisterName(int allocation_index) const;
 
  private:
   RegisterAllocationData* const data_;
   const RegisterKind mode_;
   const int num_registers_;
   int num_allocatable_registers_;
   const int* allocatable_register_codes_;
 
   DISALLOW_COPY_AND_ASSIGN(RegisterAllocator);
 };
@@ skipping 153 matching lines @@
   RegisterAllocationData* const data_;
 
   DISALLOW_COPY_AND_ASSIGN(LiveRangeConnector);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_REGISTER_ALLOCATOR_H_