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

src/frames.cc

 // Copyright 2012 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/frames.h"
 
 #include <sstream>
 
 #include "src/ast/ast.h"
 #include "src/ast/scopeinfo.h"
@@ skipping 710 matching lines @@
   if (safepoint_entry.argument_count() > 0) {
     v->VisitPointers(parameters_base,
                      parameters_base + safepoint_entry.argument_count());
     parameters_base += safepoint_entry.argument_count();
   }
 
   // Skip saved double registers.
   if (safepoint_entry.has_doubles()) {
     // Number of doubles not known at snapshot time.
     DCHECK(!isolate()->serializer_enabled());
-    parameters_base +=
-        RegisterConfiguration::ArchDefault(RegisterConfiguration::CRANKSHAFT)
-            ->num_allocatable_double_registers() *
-        kDoubleSize / kPointerSize;
+    parameters_base += RegisterConfiguration::Crankshaft()
+                           ->num_allocatable_double_registers() *
+                       kDoubleSize / kPointerSize;
   }
 
   // Visit the registers that contain pointers if any.
   if (safepoint_entry.HasRegisters()) {
     for (int i = kNumSafepointRegisters - 1; i >=0; i--) {
       if (safepoint_entry.HasRegisterAt(i)) {
         int reg_stack_index = MacroAssembler::SafepointRegisterStackIndex(i);
         v->VisitPointer(parameters_base + reg_stack_index);
       }
     }
@@ skipping 1052 matching lines @@
   for (StackFrameIterator it(isolate); !it.done(); it.Advance()) {
     StackFrame* frame = AllocateFrameCopy(it.frame(), zone);
     list.Add(frame, zone);
   }
   return list.ToVector();
 }
 
 
 }  // namespace internal
 }  // namespace v8