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

src/s390/deoptimizer-s390.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/deoptimizer.h"
 #include "src/codegen.h"
 #include "src/full-codegen/full-codegen.h"
 #include "src/register-configuration.h"
 #include "src/safepoint-table.h"
 
@@ skipping 98 matching lines @@
 
   // Save all the registers onto the stack
   const int kNumberOfRegisters = Register::kNumRegisters;
 
   RegList restored_regs = kJSCallerSaved | kCalleeSaved;
 
   const int kDoubleRegsSize = kDoubleSize * DoubleRegister::kNumRegisters;
 
   // Save all double registers before messing with them.
   __ lay(sp, MemOperand(sp, -kDoubleRegsSize));
-  const RegisterConfiguration* config =
-      RegisterConfiguration::ArchDefault(RegisterConfiguration::CRANKSHAFT);
+  const RegisterConfiguration* config = RegisterConfiguration::Crankshaft();
   for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
     int code = config->GetAllocatableDoubleCode(i);
     const DoubleRegister dreg = DoubleRegister::from_code(code);
     int offset = code * kDoubleSize;
     __ StoreDouble(dreg, MemOperand(sp, offset));
   }
 
   // Push all GPRs onto the stack
   __ lay(sp, MemOperand(sp, -kNumberOfRegisters * kPointerSize));
   __ StoreMultipleP(r0, sp, MemOperand(sp));  // Save all 16 registers
@@ skipping 198 matching lines @@
 
 void FrameDescription::SetCallerConstantPool(unsigned offset, intptr_t value) {
   // No out-of-line constant pool support.
   UNREACHABLE();
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8