RFR: 8352971: Increase maximum number of hold counts for ReentrantReadWriteLock

[Alan Bateman]

On Wed, 26 Mar 2025 16:19:16 GMT, Viktor Klang <vklang at openjdk.org> wrote:

> I'm breaking this change out as a separate improvement, since it will not be generally possible to adjust these limits on the j.u.c primitives since they might already use a backing `long` to pack in information which needs to be updated atomically (would require 128-bit atomics to widen them, and it still infeasible to change return types of pre-existing APIs).

We'll need to double check serialization compatibility as the "sync" field is in the serial form.

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PR Comment: https://git.openjdk.org/jdk/pull/24261#issuecomment-2757707809