ForLoopsLowering: Handle Iterable.withIndex() where the type is a

bounded type parameter.

TODO: Handle Sequences by extending DefaultIterableHandler.

compiler/testData/codegen/bytecodeText/forLoop/forInIterableWithIndex/forInIterableTypeParameterWithIndex.kt

@@ -0,0 +1,16 @@
+fun <T : Iterable<*>> test(iterable: T): String {
+    val s = StringBuilder()
+
+    for ((index, x) in iterable.withIndex()) {
+        s.append("$index:$x;")
+    }
+
+    return s.toString()
+}
+
+// 0 withIndex
+// 1 iterator
+// 1 hasNext
+// 1 next
+// 0 component1
+// 0 component2