Generate bridges for trait implementations properly

The intent was to keep the bridge codegen model as simple as possible: we
should be able to figure out all necessary bridges only by a minimal interface
that FunctionHandle provides (isAbstract, isDeclaration, getOverridden)

Add different tests for bridges

 #KT-318 Obsolete

compiler/testData/codegen/box/bridges/noBridgeOnMutableCollectionInheritance.kt

@@ -0,0 +1,22 @@
+import java.util.ArrayList
+import java.util.Arrays
+
+trait A {
+    fun foo(): Collection<String>
+}
+
+trait B : A {
+    override fun foo(): MutableCollection<String>
+}
+
+class C : B {
+    override fun foo(): MutableList<String> = ArrayList(Arrays.asList("C"))
+}
+
+fun box(): String {
+    val c = C()
+    var r = c.foo().iterator().next()
+    r += (c : B).foo().iterator().next()
+    r += (c : A).foo().iterator().next()
+    return if (r == "CCC") "OK" else "Fail: $r"
+}