[JS IR] Add CLI flag and configuration key about partial linkage

- make possible to turn on/off linkage if klib contains unbound symbols
 - update jsExtraHelp test data

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JSCompilerArguments.kt

@@ -235,6 +235,9 @@ class K2JSCompilerArguments : CommonCompilerArguments() {
     @Argument(value = "-Xerror-tolerance-policy", description = "Set up error tolerance policy (NONE, SEMANTIC, SYNTAX, ALL)")
     var errorTolerancePolicy: String? by NullableStringFreezableVar(null)
 
+    @Argument(value = "-Xpartial-linkage", description = "Allow unlinked symbols")
+    var partialLinkage: Boolean by FreezableVar(false)
+
     @Argument(value = "-Xwasm", description = "Use experimental WebAssembly compiler backend")
     var wasm: Boolean by FreezableVar(false)
 

compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/K2JsIrCompiler.kt

@@ -136,6 +136,8 @@ class K2JsIrCompiler : CLICompiler<K2JSCompilerArguments>() {
         configuration.put(JSConfigurationKeys.TRANSITIVE_LIBRARIES, libraries)
         configuration.put(JSConfigurationKeys.REPOSITORIES, repositories)
 
+        configuration.put(JSConfigurationKeys.PARTIAL_LINKAGE, arguments.partialLinkage)
+
         val commonSourcesArray = arguments.commonSources
         val commonSources = commonSourcesArray?.toSet() ?: emptySet()
         for (arg in arguments.freeArgs) {

compiler/testData/cli/js/jsExtraHelp.out

@@ -34,6 +34,7 @@ where advanced options include:
   -Xir-safe-external-boolean-diagnostic={log|exception}
                              Enable runtime diagnostics when access safely to boolean in external declarations
   -Xmetadata-only            Generate *.meta.js and *.kjsm files only
+  -Xpartial-linkage          Allow unlinked symbols
   -Xrepositories=<path>      Paths to additional places where libraries could be found
   -Xtyped-arrays             Translate primitive arrays to JS typed arrays
   -Xwasm                     Use experimental WebAssembly compiler backend

js/js.frontend/src/org/jetbrains/kotlin/js/config/JSConfigurationKeys.java

@@ -93,4 +93,7 @@ public class JSConfigurationKeys {
 
     public static final CompilerConfigurationKey<Collection<String>> REPOSITORIES =
             CompilerConfigurationKey.create("set up additional repository paths");
+
+    public static final CompilerConfigurationKey<Boolean> PARTIAL_LINKAGE =
+            CompilerConfigurationKey.create("allows some symbols in klibs be missed");
 }