Add regression tests for KT-46890 and other stuff

compiler/testData/codegen/box/inlineClasses/result/doubleOverride.kt

@@ -0,0 +1,19 @@
+// WITH_RUNTIME
+// IGNORE_BACKEND: JVM
+interface C<T> {
+    abstract fun foo(x: T): String
+}
+
+open class D<T> : C<Result<T>> {
+    open override fun foo(x: Result<T>): String = "???"
+}
+
+class E : D<String>() {
+    override fun foo(x: Result<String>): String = x.get()
+}
+
+fun <T> Result<T>.get(): T = getOrNull()!!
+
+fun <T> C<Result<T>>.bar(x: T) = foo(Result.success(x))
+
+fun box() = E().bar("OK")