Remove some dead code.

src/x64/register-allocator-x64.h

Index: src/x64/register-allocator-x64.h
diff --git a/src/x64/register-allocator-x64.h b/src/x64/register-allocator-x64.h
deleted file mode 100644
index a2884d9128d05df7ce7def7df88933c2657a124d..0000000000000000000000000000000000000000
--- a/src/x64/register-allocator-x64.h
+++ /dev/null
@@ -1,43 +0,0 @@
-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-//       notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-//       copyright notice, this list of conditions and the following
-//       disclaimer in the documentation and/or other materials provided
-//       with the distribution.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_X64_REGISTER_ALLOCATOR_X64_H_
-#define V8_X64_REGISTER_ALLOCATOR_X64_H_
-
-namespace v8 {
-namespace internal {
-
-class RegisterAllocatorConstants : public AllStatic {
- public:
-  static const int kNumRegisters = 10;
-  static const int kInvalidRegister = -1;
-};
-
-
-} }  // namespace v8::internal
-
-#endif  // V8_X64_REGISTER_ALLOCATOR_X64_H_