* Generate missing IR parameter declarations in external stubs
* Use origin = FAKE_OVERRIDE in external IR stubs for fake overrides
* Set .parent in external IR stubs
* Set .parent in IR generated by some utility methods
Such references require proper scope so that local symbols are bound.
Example:
```
fun <T> outer() {
abstract class ALocal<S : T> {
abstract fun bar()
}
class Local<S : T> : ALocal<S>() {
override fun bar() {}
}
}
```
Here local classes have type parameters with upper bounds depending on
function type parameters, and members overriding members in other local
classes.
If an expression 'x' has a definitely non-null type 'T1',
and is used in position with an expected type 'T2',
cast 'x' to 'T2!!' (most common non-null type T*: T* <: T2).
This introduces the following IR built-in functions required for proper
implementation of the number comparisons:
- ieee754Equals(T, T): Boolean,
for each T in {Float?, Double?}
- less(T, T): Boolean
lessOrEqual(T, T): Boolean
greater(T, T): Boolean
greaterOrEqual(T, T): Boolean
for each T in {Int, Long, Float, Double}
Dmitry Petrov