[FIR] Lookup in local sources in default imports based on the flag

Reuse ALLOW_KOTLIN_PACKAGE for that

compiler/test-infrastructure/tests/org/jetbrains/kotlin/test/builders/LanguageVersionSettingsBuilder.kt

@@ -69,6 +69,7 @@ class LanguageVersionSettingsBuilder {
             analysisFlag(AnalysisFlags.constraintSystemForOverloadResolution, directives.singleOrZeroValue(LanguageSettingsDirectives.CONSTRAINT_SYSTEM_FOR_OVERLOAD_RESOLUTION)),
             analysisFlag(AnalysisFlags.allowResultReturnType, trueOrNull(LanguageSettingsDirectives.ALLOW_RESULT_RETURN_TYPE in directives)),
             analysisFlag(AnalysisFlags.explicitApiMode, directives.singleOrZeroValue(LanguageSettingsDirectives.EXPLICIT_API_MODE)),
+            analysisFlag(AnalysisFlags.allowKotlinPackage, trueOrNull(LanguageSettingsDirectives.ALLOW_KOTLIN_PACKAGE in directives)),
 
             analysisFlag(JvmAnalysisFlags.jvmDefaultMode, directives.singleOrZeroValue(LanguageSettingsDirectives.JVM_DEFAULT_MODE)),
             analysisFlag(JvmAnalysisFlags.inheritMultifileParts, trueOrNull(LanguageSettingsDirectives.INHERIT_MULTIFILE_PARTS in directives)),

compiler/test-infrastructure/tests/org/jetbrains/kotlin/test/directives/LanguageSettingsDirectives.kt

@@ -52,6 +52,10 @@ object LanguageSettingsDirectives : SimpleDirectivesContainer() {
         additionalParser = ExplicitApiMode.Companion::fromString
     )
 
+    val ALLOW_KOTLIN_PACKAGE by directive(
+        description = "Allow compiling code in package 'kotlin' and allow not requiring kotlin.stdlib in module-info (AnalysisFlags.allowKotlinPackage)"
+    )
+
     // --------------------- Jvm Analysis Flags ---------------------
 
     val JVM_DEFAULT_MODE by enumDirective<JvmDefaultMode>(