Generate synthetic functions for local functions with default values, by

re-ordering the lowering phases.

The changes in InterfaceLowering are necessary so that IrElements that
target the removed functions are re-targeted to the new functions in
DefaultImpls. This affects local functions in interface functions since
now LocalDeclarationsLowering comes before InterfaceLowering.

compiler/testData/codegen/box/callableReference/varargAndDefaults/localFunctionWithDefault.kt

@@ -1,5 +1,5 @@
 // !LANGUAGE: +NewInference
-// IGNORE_BACKEND: JVM_IR, JS
+// IGNORE_BACKEND: JS
 
 fun call0(f: (String) -> String, x: String): String = f(x)
 fun call1(f: (String, String) -> String, x: String, y: String): String = f(x, y)