[RegisterConfiguration] Streamline access to arch defaults, simplify Registers.

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 7d4e378d47ffab57403809b081875ad83e194ff3..c0a02a8b9c55d2552626e7cf33f6cdef48b07610 100644
--- a/src/ppc/disasm-ppc.cc
+++ b/src/ppc/disasm-ppc.cc
@@ -39,6 +39,7 @@
 namespace v8 {
 namespace internal {
 
+const auto GetRegConfig = RegisterConfiguration::Crankshaft;
 
 //------------------------------------------------------------------------------
 
@@ -118,7 +119,7 @@ void Decoder::PrintRegister(int reg) {
 
 // Print the double FP register name according to the active name converter.
 void Decoder::PrintDRegister(int reg) {
-  Print(DoubleRegister::from_code(reg).ToString());
+  Print(GetRegConfig()->GetDoubleRegisterName(reg));
 }
 
 
@@ -1412,7 +1413,7 @@ const char* NameConverter::NameOfConstant(byte* addr) const {
 
 
 const char* NameConverter::NameOfCPURegister(int reg) const {
-  return v8::internal::Register::from_code(reg).ToString();
+  return v8::internal::GetRegConfig()->GetGeneralRegisterName(reg);
 }
 
 const char* NameConverter::NameOfByteCPURegister(int reg) const {