[NI] Remove hack for special functions

Treating special functions for `if`, `when`, `try`, `?:` as not accepting `Nothing` result type is incorrect.
Making so leads to cases with uninferred `Nothing` result type for inner calls and lost data flow info.

compiler/testData/diagnostics/tests/regressions/kt32836.kt

@@ -1,4 +1,5 @@
 // !DIAGNOSTICS: -UNUSED_PARAMETER
+// !WITH_NEW_INFERENCE
 
 inline fun <reified T> parse(json: String): T? = TODO()
 
@@ -6,7 +7,7 @@ class MyType
 
 fun parseMyData(json: String): MyType =
     try {
-        parse(json) // error with new inf only: Cannot use 'Nothing?' as reified type parameter
+        <!NI;REIFIED_TYPE_FORBIDDEN_SUBSTITUTION, NI;REIFIED_TYPE_FORBIDDEN_SUBSTITUTION!>parse<!>(json) // error with new inf only: Cannot use 'Nothing?' as reified type parameter
             ?: throw IllegalArgumentException("Can't parse")
     } catch (e: Exception) {
         throw IllegalArgumentException("Can't parse")