Re-reland: Remove register index/code indirection

src/compiler/instruction.cc

Index: src/compiler/instruction.cc
diff --git a/src/compiler/instruction.cc b/src/compiler/instruction.cc
index 1f6f7c9333e1d5e5feacd9a71e22b0f72d1dc0e1..4d4989effd956b563b2c730f4131abd9227f3296 100644
--- a/src/compiler/instruction.cc
+++ b/src/compiler/instruction.cc
@@ -26,11 +26,15 @@ std::ostream& operator<<(std::ostream& os,
         case UnallocatedOperand::NONE:
           return os;
         case UnallocatedOperand::FIXED_REGISTER:
-          return os << "(=" << conf->general_register_name(
-                                   unalloc->fixed_register_index()) << ")";
+          return os << "(="
+                    << conf->GetGeneralRegisterName(
+                           unalloc->fixed_register_index())
+                    << ")";
         case UnallocatedOperand::FIXED_DOUBLE_REGISTER:
-          return os << "(=" << conf->double_register_name(
-                                   unalloc->fixed_register_index()) << ")";
+          return os << "(="
+                    << conf->GetDoubleRegisterName(
+                           unalloc->fixed_register_index())
+                    << ")";
         case UnallocatedOperand::MUST_HAVE_REGISTER:
           return os << "(R)";
         case UnallocatedOperand::MUST_HAVE_SLOT:
@@ -63,14 +67,12 @@ std::ostream& operator<<(std::ostream& os,
           os << "[double_stack:" << DoubleStackSlotOperand::cast(op).index();
           break;
         case AllocatedOperand::REGISTER:
-          os << "["
-             << conf->general_register_name(RegisterOperand::cast(op).index())
+          os << "[" << RegisterOperand::cast(op).GetRegister().ToString()
              << "|R";
           break;
         case AllocatedOperand::DOUBLE_REGISTER:
-          os << "["
-             << conf->double_register_name(
-                    DoubleRegisterOperand::cast(op).index()) << "|R";
+          os << "[" << DoubleRegisterOperand::cast(op).GetRegister().ToString()
+             << "|R";
           break;
       }
       switch (allocated.machine_type()) {