Use it instead of mapPlatformClass where we only need to check emptiness
because mapPlatformClass requires built-ins and it's not always easy to come up
with the correct instance of built-ins.
In KotlinEvaluationBuilder, use the nullable function
findClassAcrossModuleDependencies instead of mapPlatformClass which uses the
throwing resolveClassByFqName. This is necessary because DefaultBuiltIns, which
are used there, are not always able to find classes mapped by a _Java_ to
Kotlin class map. (The correct solution would be not to use DefaultBuiltIns at
all, instead obtaining the correct instance of built-ins, which are almost
certainly going to be JvmBuiltIns, from the project configuration.)
Alexander Udalov
0f4b10d37d