[FIR] Import parents of companion objects first

Otherwise, information about members moved from companion objects to the
parent class (e.g. on JVM, companion object fields -> static fields in
parent class) will be incorrect.

compiler/testData/compileKotlinAgainstKotlin/importCompanion.kt

@@ -0,0 +1,16 @@
+// WITH_RUNTIME
+// TARGET_BACKEND: JVM
+// FILE: 1.kt
+package test
+
+class C(val x: String) {
+    companion object {
+        @JvmField
+        val instance: C = C("OK")
+    }
+}
+
+// FILE: 2.kt
+import test.C.Companion.instance
+
+fun box() = instance.x