Use JVM-IR compiler in scripts

[altavir]

I get java.lang.NoSuchMethodError: 'boolean kotlinx.serialization.descriptors.SerialDescriptor.isInline()' when using JVM-IR-based serialization inside the notebook. I think the problem arises because scripting does not support IR so far.

[altavir]

Here is the reproducer: https://gist.github.com/altavir/ffc4c2fc938cef312e8031a24d968e0c

My theory is that scripting runtime substitutes serialization runtime with the one not containing function only available on IR. I think that the simplest solution is to move the scripting engine to IR since it is backward compatible. IR already is default on Kotlin 1.5.

[altavir]

I've localized the problem, it is not actually IR-related (at least it is not the main problem), so I am creating the new issue.