RFR: 8253636: C2: Adjust NodeClasses::_max_classes

[Roberto Castañeda Lozano]

On Tue, 29 Sep 2020 10:08:34 GMT, Roberto Castañeda Lozano <github.com+8792647+robcasloz at openjdk.org> wrote:

>> Update `NodeClasses::_max_classes` to the max class id within the enumeration. Update comment and assertion to reflect
>> that `NodeClasses` uses now 32 bits after the addition of `Opaque1` in JDK-8229495.
>
> Update NodeClasses::_max_classes to the max class id within the
> enumeration. Update comment and assertion to reflect that NodeClasses uses now
> 32 bits after the addition of Opaque1 in JDK-8229495.

Tested on hs-tier1-3, both debug and release.

-------------

PR: https://git.openjdk.java.net/jdk/pull/397