Don't delete nested default lambda classes during inline transformation

compiler/testData/codegen/boxInline/defaultValues/lambdaInlining/checkLambdaClassIsPresent.kt

@@ -0,0 +1,17 @@
+// NO_CHECK_LAMBDA_INLINING
+// FILE: 1.kt
+package test
+
+inline fun test(p: String, s: () -> () -> String = { { p } }) =
+        s()
+
+val same = test("O")
+
+// FILE: 2.kt
+
+import test.*
+
+fun box(): String {
+    val inlined = test("K")
+    return same() + inlined()
+}