Convert UnaryOpStub to a HydrogenCodeStub

src/arm/full-codegen-arm.cc

Index: src/arm/full-codegen-arm.cc
diff --git a/src/arm/full-codegen-arm.cc b/src/arm/full-codegen-arm.cc
index 41f02be2594fc88ce829390880104cd853402ce8..7716e858d8222960e3de17ffbad84e51f5a30a08 100644
--- a/src/arm/full-codegen-arm.cc
+++ b/src/arm/full-codegen-arm.cc
@@ -4366,10 +4366,7 @@ void FullCodeGenerator::EmitUnaryOperation(UnaryOperation* expr,
                                            const char* comment) {
   // TODO(svenpanne): Allowing format strings in Comment would be nice here...
   Comment cmt(masm_, comment);
-  bool can_overwrite = expr->expression()->ResultOverwriteAllowed();
-  UnaryOverwriteMode overwrite =
-      can_overwrite ? UNARY_OVERWRITE : UNARY_NO_OVERWRITE;
-  UnaryOpStub stub(expr->op(), overwrite);
+  UnaryOpStub stub(expr->op());
   // UnaryOpStub expects the argument to be in the
   // accumulator register r0.
   VisitForAccumulatorValue(expr->expression());