Build: remove obsolete compiler arguments

These compiler arguments enable features which are enabled by default in
the current Kotlin anyway.

The only exception is in :compiler:cli which uses an old language
version.

libraries/stdlib/js-ir/build.gradle.kts

@@ -137,10 +137,8 @@ kotlin {
 tasks.withType<KotlinCompile<*>>().configureEach {
     kotlinOptions.freeCompilerArgs += listOf(
         "-Xallow-kotlin-package",
-        "-Xallow-result-return-type",
         "-Xopt-in=kotlin.ExperimentalMultiplatform",
         "-Xopt-in=kotlin.contracts.ExperimentalContracts",
-        "-Xinline-classes",
         "-Xopt-in=kotlin.RequiresOptIn",
         "-Xopt-in=kotlin.ExperimentalUnsignedTypes",
         "-Xopt-in=kotlin.ExperimentalStdlibApi"
@@ -169,4 +167,4 @@ val packFullRuntimeKLib by tasks.registering(Jar::class) {
     from(buildDir.resolve("classes/kotlin/js/main"))
     destinationDirectory.set(rootProject.buildDir.resolve("js-ir-runtime"))
     archiveFileName.set("full-runtime.klib")
-}
+}