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.
The change is a bit complicated because the name mapping logic is
refactored so that we would compute the needed suffix first (either
module name, or multifile part class name), and then shove it into the
mangled name between the original function name and "$default", if the
function in question is the default arguments adapter.
The main motivation for this change was to fix KT-41809, but as a side
effect, private functions with default arguments in multifile parts now
also contain the file name, just like normal private functions.
#KT-41809 Fixed
Ivan Kylchik