[FIR] Fix setting file in supertypes resolution

^KT-49652 Fixed

compiler/fir/analysis-tests/testData/resolve/visibility/privateAliasInSamePackage.fir.txt

@@ -0,0 +1,26 @@
+FILE: First.kt
+    package first
+
+    private final typealias Key = R|kotlin/String|
+FILE: Third.kt
+    package first
+
+    public open class Base<T> : R|kotlin/Any| {
+        public constructor<T>(): R|first/Base<T>| {
+            super<R|kotlin/Any|>()
+        }
+
+        public final fun get(): R|T?| {
+            ^get Null(null)
+        }
+
+    }
+    public final class Derived : R|first/Base<second/Second.Key>| {
+        public constructor(): R|first/Derived| {
+            super<R|first/Base<second/Second.Key>|>()
+        }
+
+    }
+    public final fun test(d: R|first/Derived|): R|kotlin/Unit| {
+        R|<local>/d|.R|SubstitutionOverride<first/Derived.get: R|second/Second.Key?|>|()?.{ $subj$.R|second/Second.Key.foo|() }
+    }

compiler/fir/analysis-tests/testData/resolve/visibility/privateAliasInSamePackage.kt

@@ -0,0 +1,33 @@
+// ISSUE: KT-49652
+// FILE: First.kt
+package first
+
+private typealias Key = String
+
+// FILE: second/Second.java
+package second
+
+public class Second {
+    public static class Key {
+        public void foo() {}
+    }
+
+    public void bar() {}
+}
+
+// FILE: Third.kt
+package first
+
+import second.Second.*
+import second.Second
+
+open class Base<T> {
+    fun get(): T? = null
+}
+
+// Key is resolved to first.Key. In fact, should be second.Second.Key, because first.Key is private-in-file
+class Derived : Base<Key>()
+
+fun test(d: Derived) {
+    d.get()?.foo()
+}