[FIR2IR] Automatically store IR declaration in its parent upon creation

Previously, creating a declaration with Fir2IrCallableDeclarationsGenerator/
  Fir2IrClassifiersGenerator didn't guarantee that this declaration will
  be actually added to the list of parent class/file declarations, which
  lead to situations when FIR2IR created some declarations in the air
  (mostly fake-overrides)

compiler/testData/ir/irText/firProblems/ErrorInDefaultValue.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 interface A {
     fun f(x: String = "OK"): String
 }