Support overload ambiguity resolution for callable references by expected type.

Resolve callable references taking into account expected callable types.

This affects call resolution procedure (resolve 'foo' in for 'foo(::bar)') similar to the approach used for function literals:

* During "shape arguments" phase of call resolution, callable references are resolved in independent context without expected type. If the callable reference is ambiguous, its shape type is a function placeholder type without parameter types and return type information. Otherwise, it is a reflection type for the resolved function or property. Upper-level call is resolved without taking into account ambiguous callable references.

* During "complete call" phase of call resolution, resolve callable reference arguments to actual descriptors (if possible), and update constraint system for the given call accordingly.

 #KT-6982 Fixed
 #KT-5780 Fixed

compiler/testData/diagnostics/tests/callableReference/function/constructorFromCompanion.kt

@@ -0,0 +1,22 @@
+// FILE: A.kt
+
+open class A<T>(val x: T)
+
+// FILE: AFactory.kt
+
+abstract class AFactory {
+    abstract fun create(): A<Int>?
+}
+
+// FILE: Util.kt
+
+inline fun <reified T> createWith(x: T, f: (T) -> A<T>?)
+        = f(x)
+
+// FILE: B.kt
+
+class B(x: Int) : A<Int>(x) {
+    companion object : AFactory() {
+        override fun create(): A<Int>? = createWith(0, ::B)
+    }
+}