Don't delete nested default lambda classes during inline transformation

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

@@ -0,0 +1,18 @@
+// NO_CHECK_LAMBDA_INLINING
+// FILE: 1.kt
+package test
+
+inline fun test(s: () -> () -> String = { { "OK" } }) =
+        s()
+
+val same = test()
+
+// FILE: 2.kt
+
+import test.*
+
+fun box(): String {
+    val inlined = test()
+    if (same() != "OK") return "fail 1: ${same()}"
+    return inlined()
+}