Suppot inlining default methods, inlining function into its default.

compiler/testData/codegen/boxInline/defaultMethod/2.kt

@@ -0,0 +1,12 @@
+package test
+
+
+inline fun <T> simpleFun(arg: String = "O", lambda: (String) -> T): T {
+    return lambda(arg)
+}
+
+
+inline fun <T> simpleFunR(lambda: (String) -> T, arg: String = "O"): T {
+    return lambda(arg)
+}
+