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

test/cctest/compiler/test-gap-resolver.cc

Index: test/cctest/compiler/test-gap-resolver.cc
diff --git a/test/cctest/compiler/test-gap-resolver.cc b/test/cctest/compiler/test-gap-resolver.cc
index 7dade3df33a5d821a71f6a2acab2d57e37149f1b..42568961ce286f8074093ec4107a36a2d75ef8f2 100644
--- a/test/cctest/compiler/test-gap-resolver.cc
+++ b/test/cctest/compiler/test-gap-resolver.cc
@@ -109,7 +109,9 @@ class InterpreterState {
       InstructionOperand source = FromKey(it->first);
       InstructionOperand destination = FromKey(it->second);
       MoveOperands mo(source, destination);
-      PrintableMoveOperands pmo = {RegisterConfiguration::ArchDefault(), &mo};
+      PrintableMoveOperands pmo = {
+          RegisterConfiguration::ArchDefault(RegisterConfiguration::TURBOFAN),
+          &mo};
       os << pmo;
     }
     return os;