Fixed propagation for non-abstract methods inherited from traits.

compiler/testData/loadKotlin/fun/PropagateDeepSubclass.kt

@@ -0,0 +1,14 @@
+package test
+
+trait A {
+  fun foo() {}
+
+  fun bar() {}
+}
+
+open class B : A {
+}
+
+class C : B() {
+  override fun bar() {}
+}

compiler/testData/loadKotlin/fun/PropagateDeepSubclass.txt

@@ -0,0 +1,18 @@
+package test
+
+internal trait A {
+    internal open fun bar() : jet.Unit
+    internal open fun foo() : jet.Unit
+}
+
+internal open class B : test.A {
+    /*primary*/ public constructor B()
+    internal open override /*1*/ /*fake_override*/ fun bar() : jet.Unit
+    internal open override /*1*/ /*fake_override*/ fun foo() : jet.Unit
+}
+
+internal final class C : test.B {
+    /*primary*/ public constructor C()
+    internal open override /*1*/ fun bar() : jet.Unit
+    internal open override /*1*/ /*fake_override*/ fun foo() : jet.Unit
+}