[turbofan] add register assignment verifier

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/zone-containers.h"
 
@@ skipping 304 matching lines @@
   int spill_start_index_;
 
   friend class RegisterAllocator;  // Assigns to kind_.
 
   DISALLOW_COPY_AND_ASSIGN(LiveRange);
 };
 
 
 class RegisterAllocator FINAL {
  public:
+  enum VerificationType { kNoVerify, kVerifyAssignment };
+
   explicit RegisterAllocator(const RegisterConfiguration* config,
                              Zone* local_zone, Frame* frame,
                              InstructionSequence* code,
                              const char* debug_name = nullptr);
 
-  bool Allocate(PipelineStatistics* stats = NULL);
+  bool Allocate(PipelineStatistics* stats = NULL,
+                VerificationType verification_type = kNoVerify);
   bool AllocationOk() { return allocation_ok_; }
   BitVector* assigned_registers() { return assigned_registers_; }
   BitVector* assigned_double_registers() { return assigned_double_registers_; }
 
   const ZoneList<LiveRange*>& live_ranges() const { return live_ranges_; }
   const ZoneVector<LiveRange*>& fixed_live_ranges() const {
     return fixed_live_ranges_;
   }
   const ZoneVector<LiveRange*>& fixed_double_live_ranges() const {
     return fixed_double_live_ranges_;
@@ skipping 193 matching lines @@
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(RegisterAllocator);
 };
 
 }
 }
 }  // namespace v8::internal::compiler
 
 #endif  // V8_REGISTER_ALLOCATOR_H_