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

src/s390/disasm-s390.cc

Index: src/s390/disasm-s390.cc
diff --git a/src/s390/disasm-s390.cc b/src/s390/disasm-s390.cc
index 274d5d95e5418bab40273fe3d3990c32384085d1..d9cf2d33cf75cd0bb591fa54108144f8e8a2887e 100644
--- a/src/s390/disasm-s390.cc
+++ b/src/s390/disasm-s390.cc
@@ -37,6 +37,8 @@
 namespace v8 {
 namespace internal {
 
+const auto GetRegConfig = RegisterConfiguration::Crankshaft;
+
 //------------------------------------------------------------------------------
 
 // Decoder decodes and disassembles instructions into an output buffer.
@@ -111,7 +113,7 @@ 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));
 }
 
 // Print SoftwareInterrupt codes. Factoring this out reduces the complexity of
@@ -1366,7 +1368,7 @@ 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 {