Remove leftovers of platformName and platformStatic in test data

Drop unnecessary imports, rename some tests

compiler/testData/codegen/boxWithStdlib/reflection/mapping/jvmStatic/objectFunction.kt

@@ -0,0 +1,20 @@
+import kotlin.reflect.KFunction
+import kotlin.reflect.jvm.*
+import kotlin.test.assertEquals
+
+object O {
+    @JvmStatic
+    fun foo(s: String): Int = s.length
+}
+
+fun box(): String {
+    val foo = O::class.members.single { it.name == "foo" } as KFunction<*>
+
+    val j = foo.javaMethod ?: return "Fail: no Java method found for O::foo"
+    assertEquals(3, j.invoke(null, "abc"))
+
+    val k = j.kotlinFunction ?: return "Fail: no Kotlin function found for Java method O::foo"
+    assertEquals(3, k.call(O, "def"))
+
+    return "OK"
+}