[K2] Inconsistent resolution of KDoc links to extensions

[vmishenev]

f lead to the the first occurrence of exstension:

open class classA
class classB : classA()


fun classA.f() = 0
fun classB.f() = 0

/**
 * [f] leads to classA.f()
 */ 
fun classA.dddd() = 0

vs

open class classA
class classB : classA()

fun classB.f() = 0
fun classA.f() = 0


/**
 * [f] leads to classB.f()
 */
fun classA.dddd() = 0

In K1, it does not depend.