These tests don't work on JVM target 1.6 after 6d664bcd10 because we're generating `Boolean.compare` which is only available since 1.8. (It is not a big deal because JVM target 1.6 is prohibited for users now.)
6d664bcd10
#KT-9304 #KT-14961 #KT-16549 #KT-21080 #KT-28234 #KT-30102 #KT-31994 #KT-34291 #KT-38099 #KT-41174 #KT-44622 #KT-44701 #KT-44781 #KT-44849 #KT-44978 #KT-45081 #KT-45286 #KT-45383 #KT-45444 #KT-45907