Add regression tests for KT-46890 and other stuff

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

@@ -0,0 +1,11 @@
+// WITH_RUNTIME
+// IGNORE_BACKEND: WASM
+interface I<T, V> {
+    fun foo(x: T): V
+}
+
+class C : I<Result<Any?>, Any?> {
+    override fun foo(x: Result<Any?>) = x.getOrNull()
+}
+
+fun box() = (C() as I<Result<Any?>, Any?>).foo(Result.success("OK"))