Revert of Reland: Remove register index/code indirection

src/x64/assembler-x64.cc

 // Copyright 2012 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.
 
 #include "src/x64/assembler-x64.h"
 
 #include <cstring>
 
 #if V8_TARGET_ARCH_X64
 
@@ skipping 98 matching lines @@
       "POPCNT=%d ATOM=%d\n",
       CpuFeatures::IsSupported(SSE3), CpuFeatures::IsSupported(SSE4_1),
       CpuFeatures::IsSupported(SAHF), CpuFeatures::IsSupported(AVX),
       CpuFeatures::IsSupported(FMA3), CpuFeatures::IsSupported(BMI1),
       CpuFeatures::IsSupported(BMI2), CpuFeatures::IsSupported(LZCNT),
       CpuFeatures::IsSupported(POPCNT), CpuFeatures::IsSupported(ATOM));
 }
 
 
 // -----------------------------------------------------------------------------
+// Register constants.
+
+const int
+    Register::kRegisterCodeByAllocationIndex[kMaxNumAllocatableRegisters] = {
+  // rax, rbx, rdx, rcx, rsi, rdi, r8, r9, r11, r12, r14, r15
+  0, 3, 2, 1, 6, 7, 8, 9, 11, 12, 14, 15
+};
+
+const int Register::kAllocationIndexByRegisterCode[kNumRegisters] = {
+  0, 3, 2, 1, -1, -1, 4, 5, 6, 7, -1, 8, 9, -1, 10, 11
+};
+
+
+// -----------------------------------------------------------------------------
 // Implementation of Operand
 
 Operand::Operand(Register base, int32_t disp) : rex_(0) {
   len_ = 1;
   if (base.is(rsp) || base.is(r12)) {
     // SIB byte is needed to encode (rsp + offset) or (r12 + offset).
     set_sib(times_1, rsp, base);
   }
 
   if (disp == 0 && !base.is(rbp) && !base.is(r13)) {
@@ skipping 3800 matching lines @@
 
 bool RelocInfo::IsInConstantPool() {
   return false;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64