Delete the old ones in package kotlin.reflect.jvm because otherwise the code
using those functions will become red in a lot less meaningful way (overload
resolution ambiguity) than if they're deleted (unresolved import)
Based on the work originally done by @dnpetrov
#KT-8380 Fixed
Currently not much you can do with them, but in the future '.java' extension
property will allow to get the Class instance from it.
Also introduce codegen tests with stdlib but without reflection in the
classpath.
Based on the work by @dnpetrov
