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

src/ia32/deoptimizer-ia32.cc

Index: src/ia32/deoptimizer-ia32.cc
diff --git a/src/ia32/deoptimizer-ia32.cc b/src/ia32/deoptimizer-ia32.cc
index 656d3e97c33c038df14570b735bd7e0c0a180ab0..c14a2a1e2eea8aa06d73c458df14e779292031f0 100644
--- a/src/ia32/deoptimizer-ia32.cc
+++ b/src/ia32/deoptimizer-ia32.cc
@@ -196,8 +196,7 @@ void Deoptimizer::TableEntryGenerator::Generate() {
 
   const int kDoubleRegsSize = kDoubleSize * XMMRegister::kMaxNumRegisters;
   __ sub(esp, Immediate(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);
     XMMRegister xmm_reg = XMMRegister::from_code(code);