FIR2IR: correct IR origin for substitution overrides

#KT-44054 Fixed

compiler/testData/codegen/box/objects/substitutionFunctionFromSuper.kt

@@ -0,0 +1,28 @@
+// KT-44054
+
+enum class Enum {
+    Entry1,
+    Entry2
+}
+
+class Outer {
+    fun fooCaller(): Enum = obj.foo()
+
+    private abstract inner class Inner<T>(val default: T) {
+        fun foo(): T {
+            return default
+        }
+    }
+
+    private val obj = object : Inner<Enum>(Enum.Entry1) {
+        fun bar(): Enum {
+            return default
+        }
+    }
+}
+
+fun box(): String {
+    val o = Outer()
+    if (o.fooCaller() != Enum.Entry1) return "Fail"
+    return "OK"
+}