PPC: Remove register index/code indirection

src/ppc/disasm-ppc.cc

Index: src/ppc/disasm-ppc.cc
diff --git a/src/ppc/disasm-ppc.cc b/src/ppc/disasm-ppc.cc
index 5d7de8a0b4287ecb7468e19e5ed00f73a5d5d9e5..9ea1dc05a8daef98a0592d38adf11111d66baca4 100644
--- a/src/ppc/disasm-ppc.cc
+++ b/src/ppc/disasm-ppc.cc
@@ -116,7 +116,9 @@ void Decoder::PrintRegister(int reg) {
 
 
 // Print the double FP register name according to the active name converter.
-void Decoder::PrintDRegister(int reg) { Print(FPRegisters::Name(reg)); }
+void Decoder::PrintDRegister(int reg) {
+  Print(DoubleRegister::from_code(reg).ToString());
+}
 
 
 // Print SoftwareInterrupt codes. Factoring this out reduces the complexity of
@@ -1349,7 +1351,7 @@ const char* NameConverter::NameOfConstant(byte* addr) const {
 
 
 const char* NameConverter::NameOfCPURegister(int reg) const {
-  return v8::internal::Registers::Name(reg);
+  return v8::internal::Register::from_code(reg).ToString();
 }
 
 const char* NameConverter::NameOfByteCPURegister(int reg) const {