Extract default language version settings for diagnostics tests

And override it in unsigned types diagnostics tests.
Remove InlineClasses feature directive from tests, because it's already
enabled in that language version.

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

@@ -233,7 +233,14 @@ abstract class AbstractDiagnosticsTest : BaseDiagnosticsTest() {
             }
         }
 
-        return result ?: CompilerTestLanguageVersionSettings(
+        return result ?: defaultLanguageVersionSettings()
+    }
+
+    /**
+     * Version settings used when no test data files have overriding version directives
+     */
+    protected open fun defaultLanguageVersionSettings(): LanguageVersionSettings {
+        return CompilerTestLanguageVersionSettings(
             DEFAULT_DIAGNOSTIC_TESTS_FEATURES,
             LanguageVersionSettingsImpl.DEFAULT.apiVersion,
             LanguageVersionSettingsImpl.DEFAULT.languageVersion

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

@@ -5,10 +5,20 @@
 
 package org.jetbrains.kotlin.checkers
 
+import org.jetbrains.kotlin.config.ApiVersion
+import org.jetbrains.kotlin.config.LanguageVersion
+import org.jetbrains.kotlin.config.LanguageVersionSettings
 import org.jetbrains.kotlin.test.ConfigurationKind
 
 abstract class AbstractDiagnosticsWithUnsignedTypes : AbstractDiagnosticsTest() {
     override fun getConfigurationKind(): ConfigurationKind {
         return ConfigurationKind.WITH_UNSIGNED_TYPES
     }
+
+    override fun defaultLanguageVersionSettings(): LanguageVersionSettings =
+        CompilerTestLanguageVersionSettings(
+            DEFAULT_DIAGNOSTIC_TESTS_FEATURES,
+            ApiVersion.KOTLIN_1_3,
+            LanguageVersion.KOTLIN_1_3
+        )
 }