RFR: 8269293: ObjectMonitor thread id fields should be 64 bits.

[Coleen Phillimore]

On Thu, 24 Jun 2021 13:05:04 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> This is a trivial change to fix the type of _previous_version_tid and _notifier_tid in ObjectMonitor to be unint64_t.
> Tested with tier1-3 and JFR tests on linux-x64-debug and windows-x64-debug.  I don't have a 32 bit system to test this out on.

Thanks David, Markus and Dan.  The github actions built linux-x86 so that's ok.

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PR: https://git.openjdk.java.net/jdk/pull/4584