work around optimizer bug SI-5672
work around optimizer bug SI-5672

the optimizer generates wrong bytecode for switches in arguments
virtpatmat happily emits a switch for a one-case switch, whereas -Xoldpatmat did not
this is not the focus of this test, hence the temporary workaround

jvican/scala,shimib/scala,martijnhoekstra/scala,felixmulder/scala,jvican/scala,slothspot/scala,lrytz/scala,slothspot/scala,lrytz/scala,slothspot/scala,shimib/scala,shimib/scala,jvican/scala,felixmulder/scala,scala/scala,jvican/scala,martijnhoekstra/scala,felixmulder/scala,shimib/scala,scala/scala,jvican/scala,lrytz/scala,shimib/scala,scala/scala,jvican/scala,shimib/scala,martijnhoekstra/scala,slothspot/scala,lrytz/scala,slothspot/scala,scala/scala,felixmulder/scala,scala/scala,felixmulder/scala,scala/scala,felixmulder/scala,martijnhoekstra/scala,martijnhoekstra/scala,felixmulder/scala,jvican/scala,martijnhoekstra/scala,lrytz/scala,slothspot/scala,slothspot/scala,lrytz/scala