[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/frontend/src/org/jetbrains/kotlin/resolve/calls/tower/KotlinResolutionStatelessCallbacksImpl.kt

@@ -97,12 +97,4 @@ class KotlinResolutionStatelessCallbacksImpl(
         else
             ConstraintSystemBuilderImpl.forSpecificity()
     }
-
-    override fun isSpecialFunctionTypeParameterName(name: Name): Boolean {
-        return ControlStructureTypingUtils.ResolveConstruct.values().any { it.specialTypeParameterName == name }
-    }
-
-    override fun isExclExclTypeParameterName(name: Name): Boolean {
-        return name == ControlStructureTypingUtils.ResolveConstruct.EXCL_EXCL.specialTypeParameterName
-    }
 }