Language feature for new inline class mangling rules (since 1.4)

compiler/testData/codegen/bytecodeText/inlineClasses/noReturnTypeMangling.kt

@@ -0,0 +1,17 @@
+// !LANGUAGE: +InlineClasses -MangleClassMembersReturningInlineClasses
+// IGNORE_BACKEND: JVM_IR
+
+inline class S(val x: String)
+
+class Test {
+    fun getO() = S("O")
+    val k = S("K")
+}
+
+fun box(): String {
+    val t = Test()
+    return t.getO().x + t.k.x
+}
+
+// 1 public final getO\(\)Ljava/lang/String;
+// 1 public final getK\(\)Ljava/lang/String;