Renamed -Xklib-mpp to -Xexpect-actual-linker to reduce user confusion

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

@@ -321,10 +321,10 @@ abstract class CommonCompilerArguments : CommonToolArguments() {
     var useMixedNamedArguments: Boolean by FreezableVar(false)
 
     @Argument(
-        value = "-Xklib-mpp",
-        description = "Enable experimental support for multi-platform klib libraries"
+        value = "-Xexpect-actual-linker",
+        description = "Enable experimental expect/actual linker"
     )
-    var klibBasedMpp: Boolean by FreezableVar(false)
+    var expectActualLinker: Boolean by FreezableVar(false)
 
     @Argument(value = "-Xdisable-default-scripting-plugin", description = "Do not enable scripting plugin by default")
     var disableDefaultScriptingPlugin: Boolean by FreezableVar(false)
@@ -347,7 +347,7 @@ abstract class CommonCompilerArguments : CommonToolArguments() {
                 collector.report(CompilerMessageSeverity.WARNING, "'-Xexperimental' is deprecated and will be removed in a future release")
             }
             put(AnalysisFlags.useExperimental, useExperimental?.toList().orEmpty() + optIn?.toList().orEmpty())
-            put(AnalysisFlags.klibBasedMpp, klibBasedMpp)
+            put(AnalysisFlags.expectActualLinker, expectActualLinker)
             put(AnalysisFlags.explicitApiVersion, apiVersion != null)
             put(AnalysisFlags.allowResultReturnType, allowResultReturnType)
             ExplicitApiMode.fromString(explicitApi)?.also { put(AnalysisFlags.explicitApiMode, it) } ?: collector.report(