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

src/arm/disasm-arm.cc

Index: src/arm/disasm-arm.cc
diff --git a/src/arm/disasm-arm.cc b/src/arm/disasm-arm.cc
index 054cb2c1cff5b0a79e74394d27c393fd8c2f5a41..1bb33fa0e82d347653b3ccc45f40c7a8868b4248 100644
--- a/src/arm/disasm-arm.cc
+++ b/src/arm/disasm-arm.cc
@@ -40,6 +40,7 @@
 namespace v8 {
 namespace internal {
 
+const auto GetRegConfig = RegisterConfiguration::Crankshaft;
 
 //------------------------------------------------------------------------------
 
@@ -2059,7 +2060,7 @@ 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);
 }