Rewrite out-of-block modifier increment algorithm

1. Search the top-level function or property (only they can produce blocks that won't affect other declarations)
    2. Check if current position is hidden by this declaration

    O^2 behaviour is removed

idea/testData/codeInsight/outOfBlock/InFunInFunctionInitializerInFun.kt

@@ -0,0 +1,11 @@
+// TRUE
+
+val a = 1
+fun test() = if (a) {
+    fun hello() {
+        <caret>
+    }
+}
+else {
+
+}