[FIR2IR] Properly calculate dispatch receiver type for fake overrides

If some function is not fake-override, then its type should be just
  default type of containing class
For fake overrides the default type calculated in the following way:
1. Find first overridden function, which is not fake override
2. Take its containing class
3. Find supertype of current containing class with type constructor of
   class from step 2

^KT-60252 Fixed

compiler/testData/ir/irText/expressions/funInterface/functionSupertype.fir.ir.txt

@@ -1,31 +0,0 @@
-FILE fqName:<root> fileName:/functionSupertype.kt
-  CLASS INTERFACE name:Foo modality:ABSTRACT visibility:public [fun] superTypes:[kotlin.Function0<kotlin.Int>]
-    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.Foo
-    FUN FAKE_OVERRIDE name:invoke visibility:public modality:ABSTRACT <> ($this:kotlin.Function0<R of kotlin.Function0>) returnType:kotlin.Int [fake_override,operator]
-      overridden:
-        public abstract fun invoke (): R of kotlin.Function0 declared in kotlin.Function0
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Function0<R of kotlin.Function0>
-    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
-      overridden:
-        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in kotlin.Function0
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
-    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
-      overridden:
-        public open fun hashCode (): kotlin.Int declared in kotlin.Function0
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
-      overridden:
-        public open fun toString (): kotlin.String declared in kotlin.Function0
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-  FUN name:id visibility:public modality:FINAL <> (foo:<root>.Foo) returnType:kotlin.Any
-    VALUE_PARAMETER name:foo index:0 type:<root>.Foo
-    BLOCK_BODY
-      RETURN type=kotlin.Nothing from='public final fun id (foo: <root>.Foo): kotlin.Any declared in <root>'
-        GET_VAR 'foo: <root>.Foo declared in <root>.id' type=<root>.Foo origin=null
-  FUN name:test visibility:public modality:FINAL <> (foo:<root>.Foo) returnType:kotlin.Unit
-    VALUE_PARAMETER name:foo index:0 type:<root>.Foo
-    BLOCK_BODY
-      TYPE_OP type=kotlin.Unit origin=IMPLICIT_COERCION_TO_UNIT typeOperand=kotlin.Unit
-        CALL 'public final fun id (foo: <root>.Foo): kotlin.Any declared in <root>' type=kotlin.Any origin=null
-          foo: GET_VAR 'foo: <root>.Foo declared in <root>.test' type=<root>.Foo origin=null

compiler/testData/ir/irText/expressions/funInterface/functionSupertype.fir.kt.txt

@@ -1,11 +0,0 @@
-fun interface Foo : Function0<Int> {
-
-}
-
-fun id(foo: Foo): Any {
-  return foo
-}
-
-fun test(foo: Foo) {
-  id(foo = foo) /*~> Unit */
-}

compiler/testData/ir/irText/expressions/funInterface/functionSupertype.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // DONT_TARGET_EXACT_BACKEND: JS_IR
 
 fun interface Foo : () -> Int