[JS FIR] Add JsName clash test

^KT-64364

compiler/testData/diagnostics/testsWithJsStdLib/name/companionInheritsOwnerClass.kt

@@ -0,0 +1,15 @@
+// !OPT_IN: kotlin.js.ExperimentalJsExport
+// FIR_IDENTICAL
+@file:JsExport
+
+interface Optional<out T> {
+    @JsName("valueOrThrowException")
+    fun valueOrThrow(exp: Throwable): T
+
+    fun valueOrThrow(): T = valueOrThrow(NoSuchElementException("Optional has no value"))
+}
+
+abstract class None<out T : Any> private constructor() : Optional<T> {
+    companion object : None<Nothing>()
+    override fun valueOrThrow(exp: Throwable): Nothing = throw exp
+}