C2: optimize long range checks in long counted loops

JDK-8255150 makes it possible for java code to explicitly perform a range check on long values. JDK-8223051 provides a transformation of long counted loops into loop nests with an inner int counted loop. With this change I propose transforming long range checks that operate on the iv of a long counted loop into range checks that operate on the iv of the int inner loop once it has been created. Existing range check eliminations can then kick in.