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

test/unittests/compiler/instruction-selector-unittest.cc

Index: test/unittests/compiler/instruction-selector-unittest.cc
diff --git a/test/unittests/compiler/instruction-selector-unittest.cc b/test/unittests/compiler/instruction-selector-unittest.cc
index f5c2971bd86d2455942e97752b3fb8502b00e47d..17dc6277ea894cbfd4557e53743becda7ea3eea4 100644
--- a/test/unittests/compiler/instruction-selector-unittest.cc
+++ b/test/unittests/compiler/instruction-selector-unittest.cc
@@ -51,7 +51,8 @@ InstructionSelectorTest::Stream InstructionSelectorTest::StreamBuilder::Build(
   if (FLAG_trace_turbo) {
     OFStream out(stdout);
     PrintableInstructionSequence printable = {
-        RegisterConfiguration::ArchDefault(), &sequence};
+        RegisterConfiguration::ArchDefault(RegisterConfiguration::TURBOFAN),
+        &sequence};
     out << "=== Code sequence after instruction selection ===" << std::endl
         << printable;
   }