Added static methods, nested classes and companion object from superclasses.

compiler/testData/diagnostics/tests/scopes/inheritance/severalCompanions.kt

@@ -0,0 +1,22 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+open class A {
+    companion object {
+        fun foo() = 1
+        fun bar(a: String) = a
+    }
+}
+
+open class B: A() {
+    companion object {
+        fun foo() = ""
+        fun bar(a: Int) = a
+    }
+}
+
+class C: B() {
+    init {
+        val a: String = foo()
+        val b: Int = bar(1)
+        val c: String = bar("")
+    }
+}