[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/tests/org/jetbrains/kotlin/checkers/DiagnosticsTestGenerated.java

@@ -17965,6 +17965,11 @@ public class DiagnosticsTestGenerated extends AbstractDiagnosticsTest {
                 runTest("compiler/testData/diagnostics/tests/regressions/SpecififcityByReceiver.kt");
             }
 
+            @TestMetadata("testNestedSpecialCalls.kt")
+            public void testTestNestedSpecialCalls() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/regressions/testNestedSpecialCalls.kt");
+            }
+
             @TestMetadata("TypeMismatchOnUnaryOperations.kt")
             public void testTypeMismatchOnUnaryOperations() throws Exception {
                 runTest("compiler/testData/diagnostics/tests/regressions/TypeMismatchOnUnaryOperations.kt");

compiler/tests/org/jetbrains/kotlin/checkers/javac/DiagnosticsUsingJavacTestGenerated.java

@@ -17955,6 +17955,11 @@ public class DiagnosticsUsingJavacTestGenerated extends AbstractDiagnosticsUsing
                 runTest("compiler/testData/diagnostics/tests/regressions/SpecififcityByReceiver.kt");
             }
 
+            @TestMetadata("testNestedSpecialCalls.kt")
+            public void testTestNestedSpecialCalls() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/regressions/testNestedSpecialCalls.kt");
+            }
+
             @TestMetadata("TypeMismatchOnUnaryOperations.kt")
             public void testTypeMismatchOnUnaryOperations() throws Exception {
                 runTest("compiler/testData/diagnostics/tests/regressions/TypeMismatchOnUnaryOperations.kt");