We are going to deprecate `WITH_RUNTIME` directive. The main reason
behind this change is that `WITH_STDLIB` directive better describes
its meaning, specifically it will add kotlin stdlib to test's classpath.
We might want to add 'init' blocks later, so now, for the sake of
binary compatibility with 1.3-RC binaries, we have to generate these
'constructor' calls.
Note that in some tests inline class boxing is no longer redundant,
because resulting value is passed to 'constructor' as an argument.
Evgeniy.Zhelenskiy