Convert FunctionBase to Kotlin, add type parameter to Lambda

This will make it possible to avoid raw types when inheriting from both
FunctionBase and Function<R>. This change adds a generic type parameter
to FunctionBase and Lambda which is not source-breaking under our policy
because both FunctionBase and Lambda are internal classes (located in
package kotlin.jvm.internal)

libraries/stdlib/jvm/src/kotlin/coroutines/experimental/jvm/internal/CoroutineImpl.kt

@@ -18,7 +18,7 @@ abstract class CoroutineImpl(
     arity: Int,
     @JvmField
     protected var completion: Continuation<Any?>?
-) : Lambda(arity), Continuation<Any?> {
+) : Lambda<Any?>(arity), Continuation<Any?> {
 
     // label == -1 when coroutine cannot be started (it is just a factory object) or has already finished execution
     // label == 0 in initial part of the coroutine