Revert of Reland: Remove register index/code indirection

src/arm64/utils-arm64.h

 // Copyright 2013 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_ARM64_UTILS_ARM64_H_
 #define V8_ARM64_UTILS_ARM64_H_
 
 #include <cmath>
 
 #include "src/arm64/constants-arm64.h"
 
+#define REGISTER_CODE_LIST(R)                                                  \
+R(0)  R(1)  R(2)  R(3)  R(4)  R(5)  R(6)  R(7)                                 \
+R(8)  R(9)  R(10) R(11) R(12) R(13) R(14) R(15)                                \
+R(16) R(17) R(18) R(19) R(20) R(21) R(22) R(23)                                \
+R(24) R(25) R(26) R(27) R(28) R(29) R(30) R(31)
+
 namespace v8 {
 namespace internal {
 
 // These are global assumptions in v8.
 STATIC_ASSERT((static_cast<int32_t>(-1) >> 1) == -1);
 STATIC_ASSERT((static_cast<uint32_t>(-1) >> 1) == 0x7FFFFFFF);
 
 // Floating point representation.
 static inline uint32_t float_to_rawbits(float value) {
   uint32_t bits = 0;
@@ skipping 120 matching lines @@
 
 
 inline float FusedMultiplyAdd(float op1, float op2, float a) {
   return fmaf(op1, op2, a);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ARM64_UTILS_ARM64_H_