[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/resolution/src/org/jetbrains/kotlin/resolve/calls/components/ExternalComponents.kt

@@ -40,10 +40,6 @@ interface KotlinResolutionStatelessCallbacks {
     fun createConstraintSystemForOverloadResolution(
         constraintInjector: ConstraintInjector, builtIns: KotlinBuiltIns
     ): SimpleConstraintSystem
-
-    fun isSpecialFunctionTypeParameterName(name: Name): Boolean
-
-    fun isExclExclTypeParameterName(name: Name): Boolean
 }
 
 // This components hold state (trace). Work with this carefully.

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/inference/components/ResultTypeResolver.kt

@@ -30,8 +30,7 @@ import org.jetbrains.kotlin.types.model.TypeSystemInferenceExtensionContext
 
 class ResultTypeResolver(
     val typeApproximator: AbstractTypeApproximator,
-    val trivialConstraintTypeInferenceOracle: TrivialConstraintTypeInferenceOracle,
-    private val statelessCallbacks: KotlinResolutionStatelessCallbacks? // TODO injection in FIR
+    val trivialConstraintTypeInferenceOracle: TrivialConstraintTypeInferenceOracle
 ) {
     interface Context : TypeSystemInferenceExtensionContext {
         fun isProperType(type: KotlinTypeMarker): Boolean
@@ -85,20 +84,12 @@ class ResultTypeResolver(
             if (!checkConstraint(this, constraint.type, constraint.kind, resultType)) return false
         }
         if (!trivialConstraintTypeInferenceOracle.isSuitableResultedType(resultType)) {
-            if (nothingIsForbiddenFor(variableWithConstraints.typeVariable)) return false
             if (resultType.isNullableType() && checkSingleLowerNullabilityConstraint(filteredConstraints)) return false
         }
 
         return true
     }
 
-    private fun nothingIsForbiddenFor(variable: TypeVariableMarker): Boolean {
-        val parameterName = variable.safeAs<TypeVariableFromCallableDescriptor>()?.originalTypeParameter?.name ?: return false
-        val isSpecialFunctionParameter = statelessCallbacks?.isSpecialFunctionTypeParameterName(parameterName) ?: false
-        val isFromExclExcl = isSpecialFunctionParameter && statelessCallbacks?.isExclExclTypeParameterName(parameterName) ?: false
-        return isSpecialFunctionParameter && !isFromExclExcl
-    }
-
     private fun checkSingleLowerNullabilityConstraint(constraints: List<Constraint>): Boolean {
         return constraints.singleOrNull { it.kind.isLower() }?.isNullabilityConstraint ?: false
     }