Cleanup FE analysis flag allowKotlinPackage

It was used to allow custom contracts when compiling stdlib
with the Kotlin 1.2 compiler. Since 1.3 compiler is used now, this
flag is no longer necessary.

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/CommonCompilerArguments.kt

@@ -314,7 +314,6 @@ abstract class CommonCompilerArguments : CommonToolArguments() {
         return HashMap<AnalysisFlag<*>, Any>().apply {
             put(AnalysisFlags.skipMetadataVersionCheck, skipMetadataVersionCheck)
             put(AnalysisFlags.multiPlatformDoNotCheckActual, noCheckActual)
-            put(AnalysisFlags.allowKotlinPackage, allowKotlinPackage)
             put(AnalysisFlags.experimental, experimental?.toList().orEmpty())
             put(AnalysisFlags.useExperimental, useExperimental?.toList().orEmpty())
             put(AnalysisFlags.explicitApiVersion, apiVersion != null)

compiler/frontend/src/org/jetbrains/kotlin/config/AnalysisFlags.kt

@@ -12,9 +12,6 @@ object AnalysisFlags {
     @JvmStatic
     val multiPlatformDoNotCheckActual by AnalysisFlag.Delegates.Boolean
 
-    @JvmStatic
-    val allowKotlinPackage by AnalysisFlag.Delegates.Boolean
-
     @JvmStatic
     val experimental by AnalysisFlag.Delegates.ListOfStrings
 

compiler/frontend/src/org/jetbrains/kotlin/contracts/parsing/ContractParsingServices.kt

@@ -91,9 +91,7 @@ class ContractParsingServices(val languageVersionSettings: LanguageVersionSettin
     }
 
     private fun checkFeatureEnabled(collector: ContractParsingDiagnosticsCollector) {
-        val isFeatureTurnedOn = languageVersionSettings.supportsFeature(LanguageFeature.AllowContractsForCustomFunctions) ||
-                // This condition is here for technical purposes of compiling 1.2-runtime with contracts
-                languageVersionSettings.getFlag(AnalysisFlags.allowKotlinPackage)
+        val isFeatureTurnedOn = languageVersionSettings.supportsFeature(LanguageFeature.AllowContractsForCustomFunctions)
         if (!isFeatureTurnedOn) {
             collector.unsupportedFeature(languageVersionSettings)
         }

compiler/frontend/src/org/jetbrains/kotlin/resolve/FunctionDescriptorResolver.kt

@@ -258,9 +258,7 @@ class FunctionDescriptorResolver(
     ): LazyContractProvider? {
         if (function !is KtNamedFunction) return null
 
-        val isContractsEnabled = languageVersionSettings.supportsFeature(LanguageFeature.AllowContractsForCustomFunctions) ||
-                // We need to enable contracts if we're compiling "kotlin"-package to be able to ship contracts in stdlib in 1.2
-                languageVersionSettings.getFlag(AnalysisFlags.allowKotlinPackage)
+        val isContractsEnabled = languageVersionSettings.supportsFeature(LanguageFeature.AllowContractsForCustomFunctions)
 
         if (!isContractsEnabled || !function.mayHaveContract()) return null