Re-reland: Remove register index/code indirection

src/x64/assembler-x64.cc

Index: src/x64/assembler-x64.cc
diff --git a/src/x64/assembler-x64.cc b/src/x64/assembler-x64.cc
index cb93ab878b9517a1348d32df1914fa9cff856f65..059b576beaa42d52765c8b383762199a0a14e392 100644
--- a/src/x64/assembler-x64.cc
+++ b/src/x64/assembler-x64.cc
@@ -116,20 +116,6 @@ void CpuFeatures::PrintFeatures() {
 
 
 // -----------------------------------------------------------------------------
-// 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) {