Move some tests from boxWithStdlib/ to box/

Move those tests which do not require neither stdlib nor reflect

compiler/testData/codegen/box/callableReference/function/extensionFromTopLevelStringOneStringArg.kt

@@ -0,0 +1,8 @@
+class A
+
+fun A.foo(result: String) = result
+
+fun box(): String {
+    val x = A::foo
+    return x(A(), "OK")
+}