[KLIB] Support partially linked klibs in Ir linker

Now it's possible to compile against klib even if in there are
references to declarations from other klibs which are no longer existed

 - add switch flag to turn on/off that mode
 - pass switch flag from JS CLI to JS Linker

compiler/ir/serialization.js/src/org/jetbrains/kotlin/ir/backend/js/klib.kt

@@ -412,6 +412,8 @@ fun getIrModuleInfoForKlib(
     val typeTranslator = TypeTranslatorImpl(symbolTable, configuration.languageVersionSettings, moduleDescriptor)
     val irBuiltIns = IrBuiltInsOverDescriptors(moduleDescriptor.builtIns, typeTranslator, symbolTable)
 
+    val allowUnboundSymbols = configuration[JSConfigurationKeys.PARTIAL_LINKAGE] ?: false
+
     val irLinker =
         JsIrLinker(
             null,
@@ -421,7 +423,8 @@ fun getIrModuleInfoForKlib(
             null,
             null,
             loweredIcData,
-            friendModules
+            friendModules,
+            allowUnboundSymbols
         )
 
     val deserializedModuleFragmentsToLib = deserializeDependencies(sortedDependencies, irLinker, mainModuleLib, filesToLoad, mapping)
@@ -479,7 +482,8 @@ fun getIrModuleInfoForSourceFiles(
             feContext,
             null,
             loweredIcData,
-            friendModules
+            friendModules,
+            allowUnboundSymbols
         )
     val deserializedModuleFragmentsToLib = deserializeDependencies(allSortedDependencies, irLinker, null,null, mapping)
     val deserializedModuleFragments = deserializedModuleFragmentsToLib.keys.toList()

compiler/ir/serialization.js/src/org/jetbrains/kotlin/ir/backend/js/lower/serialization/ir/JsIrLinker.kt

@@ -30,8 +30,9 @@ class JsIrLinker(
     override val translationPluginContext: TranslationPluginContext?,
     private val icData: ICData? = null,
     private val loweredIcData: Map<ModuleDescriptor, SerializedIcData> = emptyMap(),
-    friendModules: Map<String, Collection<String>> = emptyMap()
-) : KotlinIrLinker(currentModule, messageLogger, builtIns, symbolTable, emptyList()) {
+    friendModules: Map<String, Collection<String>> = emptyMap(),
+    allowUnboundSymbols: Boolean = false
+) : KotlinIrLinker(currentModule, messageLogger, builtIns, symbolTable, emptyList(), allowUnboundSymbols) {
 
     override val fakeOverrideBuilder = FakeOverrideBuilder(this, symbolTable, JsManglerIr, IrTypeSystemContextImpl(builtIns), friendModules)