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

src/compiler/pipeline.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/compiler/pipeline.h"
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
 
 #include "src/base/adapters.h"
@@ skipping 1649 matching lines @@
     data_->set_source_position_output(source_position_output.str());
   }
 
   data->DeleteGraphZone();
 
   data->BeginPhaseKind("register allocation");
 
   bool run_verifier = FLAG_turbo_verify_allocation;
 
   // Allocate registers.
-  AllocateRegisters(
-      RegisterConfiguration::ArchDefault(RegisterConfiguration::TURBOFAN),
-      call_descriptor, run_verifier);
+  AllocateRegisters(RegisterConfiguration::Turbofan(), call_descriptor,
+                    run_verifier);
   Run<FrameElisionPhase>();
   if (data->compilation_failed()) {
     info()->AbortOptimization(kNotEnoughVirtualRegistersRegalloc);
     data->EndPhaseKind();
     return false;
   }
 
   // TODO(mtrofin): move this off to the register allocator.
   bool generate_frame_at_start =
       data_->sequence()->instruction_blocks().front()->must_construct_frame();
@@ skipping 147 matching lines @@
   data->DeleteRegisterAllocationZone();
 }
 
 CompilationInfo* PipelineImpl::info() const { return data_->info(); }
 
 Isolate* PipelineImpl::isolate() const { return info()->isolate(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8