Remove some dead code.

src/x64/register-allocator-x64-inl.h

-// 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_INL_H_
-#define V8_X64_REGISTER_ALLOCATOR_X64_INL_H_
-
-#include "v8.h"
-
-namespace v8 {
-namespace internal {
-
-// -------------------------------------------------------------------------
-// RegisterAllocator implementation.
-
-bool RegisterAllocator::IsReserved(Register reg) {
-  return reg.is(rsp) || reg.is(rbp) || reg.is(rsi) ||
-      reg.is(kScratchRegister) || reg.is(kRootRegister) ||
-      reg.is(kSmiConstantRegister);
-}
-
-
-// The register allocator uses small integers to represent the
-// non-reserved assembler registers.
-int RegisterAllocator::ToNumber(Register reg) {
-  ASSERT(reg.is_valid() && !IsReserved(reg));
-  const int kNumbers[] = {
-    0,   // rax
-    2,   // rcx
-    3,   // rdx
-    1,   // rbx
-    -1,  // rsp  Stack pointer.
-    -1,  // rbp  Frame pointer.
-    -1,  // rsi  Context.
-    4,   // rdi
-    5,   // r8
-    6,   // r9
-    -1,  // r10  Scratch register.
-    8,   // r11
-    -1,  // r12  Smi constant.
-    -1,  // r13  Roots array.  This is callee saved.
-    7,   // r14
-    9    // r15
-  };
-  return kNumbers[reg.code()];
-}
-
-
-Register RegisterAllocator::ToRegister(int num) {
-  ASSERT(num >= 0 && num < kNumRegisters);
-  const Register kRegisters[] =
-      { rax, rbx, rcx, rdx, rdi, r8, r9, r14, r11, r15 };
-  return kRegisters[num];
-}
-
-
-void RegisterAllocator::Initialize() {
-  Reset();
-  // The non-reserved rdi register is live on JS function entry.
-  Use(rdi);  // JS function.
-}
-} }  // namespace v8::internal
-
-#endif  // V8_X64_REGISTER_ALLOCATOR_X64_INL_H_