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/wasm/build.gradle.kts

@@ -73,10 +73,8 @@ 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"