Add a file in package 'kotlin.jvm.functions' to the project and replace
explicit imports of functions 'kotlin.Function{n}' to two imports 'kotlin.*'
and 'kotlin.jvm.functions.*', so that the codebase can be compiled both by the
old and by the new compiler
Introduce DeclarationDescriptor.builtIns extension to get builtins where descriptors are available
Introduce various utilities in KotlinBuiltIns to check for primitive types and get fq names of builtins
Alexander Udalov