provides a mechanism for optimizing compilers to select the different Register configuration.

src/compiler/pipeline.cc

Index: src/compiler/pipeline.cc
diff --git a/src/compiler/pipeline.cc b/src/compiler/pipeline.cc
index 7d414753b8cf4012001c516a95b9e88e95fdb937..f9adad7922b88d10943f2453bcb950afef3d1481 100644
--- a/src/compiler/pipeline.cc
+++ b/src/compiler/pipeline.cc
@@ -1326,8 +1326,9 @@ Handle<Code> Pipeline::ScheduleAndGenerateCode(
 
   bool run_verifier = FLAG_turbo_verify_allocation;
   // Allocate registers.
-  AllocateRegisters(RegisterConfiguration::ArchDefault(), call_descriptor,
-                    run_verifier);
+  AllocateRegisters(
+      RegisterConfiguration::ArchDefault(RegisterConfiguration::TURBOFAN),
+      call_descriptor, run_verifier);
   if (data->compilation_failed()) {
     info()->AbortOptimization(kNotEnoughVirtualRegistersRegalloc);
     return Handle<Code>();