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/traitImplInheritsTraitImpl.kt

@@ -0,0 +1,15 @@
+trait A {
+    fun foo(): Any = "A"
+}
+
+trait B : A {
+    override fun foo(): String = "B"
+}
+
+class C : B
+
+fun box(): String {
+    val c = C()
+    var r = c.foo() + (c : B).foo() + (c : A).foo()
+    return if (r == "BBB") "OK" else "Fail: $r"
+}