[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

core/compiler.common/src/org/jetbrains/kotlin/builtins/StandardNames.kt

@@ -31,6 +31,8 @@ object StandardNames {
     @JvmField val DATA_CLASS_COMPONENT_PREFIX = "component"
 
     @JvmField val HASHCODE_NAME = Name.identifier("hashCode")
+    @JvmField val TO_STRING_NAME = Name.identifier("toString")
+    @JvmField val EQUALS_NAME = Name.identifier("equals")
 
     @JvmField val CHAR_CODE = Name.identifier("code")