Minor, drop unused directive and test

The directive was only used in this test and it had no effect on the
behavior of the test. The test is removed because it's equivalent to
simple.kt in the same directory

compiler/testData/diagnostics/tests/delegation/memberHidesSupertypeOverride/simple1.0.kt

@@ -1,21 +0,0 @@
-// !LANGUAGE_VERSION: 1.0
-
-public interface Base {
-    fun getValue(): String
-
-    fun test() = getValue()
-}
-
-class Delegate : Base {
-    override fun getValue() = "Delegate"
-}
-
-public abstract class MyClass : Base {
-    override fun test(): String {
-        return "Class"
-    }
-}
-
-<!DELEGATED_MEMBER_HIDES_SUPERTYPE_OVERRIDE!>class A<!> : MyClass(), Base by Delegate() {
-    override fun getValue() = "Delegate"
-}

compiler/testData/diagnostics/tests/delegation/memberHidesSupertypeOverride/simple1.0.txt

@@ -1,36 +0,0 @@
-package
-
-public final class A : MyClass, Base {
-    public constructor A()
-    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public open override /*2*/ fun getValue(): kotlin.String
-    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public open override /*2*/ /*delegation*/ fun test(): kotlin.String
-    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
-}
-
-public interface Base {
-    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public abstract fun getValue(): kotlin.String
-    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public open fun test(): kotlin.String
-    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-}
-
-public final class Delegate : Base {
-    public constructor Delegate()
-    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public open override /*1*/ fun getValue(): kotlin.String
-    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public open override /*1*/ /*fake_override*/ fun test(): kotlin.String
-    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-}
-
-public abstract class MyClass : Base {
-    public constructor MyClass()
-    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public abstract override /*1*/ /*fake_override*/ fun getValue(): kotlin.String
-    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public open override /*1*/ fun test(): kotlin.String
-    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-}

compiler/tests-common/org/jetbrains/kotlin/checkers/BaseDiagnosticsTest.kt

@@ -279,7 +279,6 @@ abstract class BaseDiagnosticsTest : KotlinMultiFileTestWithJava<TestModule, Tes
         )
 
         val LANGUAGE_DIRECTIVE = "LANGUAGE"
-        val LANGUAGE_VERSION = "LANGUAGE_VERSION"
         private val LANGUAGE_PATTERN = Pattern.compile("(\\+|\\-|warn:)(\\w+)\\s*")
 
         val DEFAULT_DIAGNOSTIC_TESTS_FEATURES = mapOf(
@@ -311,17 +310,14 @@ abstract class BaseDiagnosticsTest : KotlinMultiFileTestWithJava<TestModule, Tes
         private fun parseLanguageVersionSettings(directiveMap: Map<String, String>): LanguageVersionSettings? {
             val apiVersionString = directiveMap[API_VERSION_DIRECTIVE]
             val directives = directiveMap[LANGUAGE_DIRECTIVE]
-            val languageVersionDirective = directiveMap[LANGUAGE_VERSION]
-            if (apiVersionString == null && directives == null && languageVersionDirective == null) return null
+            if (apiVersionString == null && directives == null) return null
 
             val apiVersion = (if (apiVersionString != null) ApiVersion.parse(apiVersionString) else ApiVersion.LATEST_STABLE)
                              ?: error("Unknown API version: $apiVersionString")
 
             val languageFeatures = directives?.let(this::collectLanguageFeatureMap).orEmpty()
 
-            val languageVersion: LanguageVersion = languageVersionDirective?.let { LanguageVersion.fromVersionString(it) } ?: LanguageVersion.LATEST_STABLE
-
-            return DiagnosticTestLanguageVersionSettings(languageFeatures, apiVersion, languageVersion)
+            return DiagnosticTestLanguageVersionSettings(languageFeatures, apiVersion, LanguageVersion.LATEST_STABLE)
         }
 
         private fun collectLanguageFeatureMap(directives: String): Map<LanguageFeature, LanguageFeature.State> {

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

@@ -6270,12 +6270,6 @@ public class DiagnosticsTestGenerated extends AbstractDiagnosticsTest {
                     doTest(fileName);
                 }
 
-                @TestMetadata("simple1.0.kt")
-                public void testSimple1_0() throws Exception {
-                    String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/delegation/memberHidesSupertypeOverride/simple1.0.kt");
-                    doTest(fileName);
-                }
-
                 @TestMetadata("simpleNoOverride.kt")
                 public void testSimpleNoOverride() throws Exception {
                     String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/delegation/memberHidesSupertypeOverride/simpleNoOverride.kt");