RFR: 8255119: Monitor::wait takes signed integer as timeout [v2]

[David Holmes]

> Please review this simple cleanup of the JVM `Monitor`/`PlatformMonitor` code so that timeouts are expressed as unsigned rather than signed values i.e. `int64_t`/`jlong` -> `uint64_t`.
> 
> Testing:
>  - tiers 1-3
>  - all builds in Oracle CI in tiers 1-5, plus shenandoah GC on LInux x64
> 
> Thanks

David Holmes has updated the pull request incrementally with one additional commit since the last revision:

  Clarify that win32 API takes DWORD

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/11898/files
  - new: https://git.openjdk.org/jdk/pull/11898/files/674892df..bad1584f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11898&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11898&range=00-01

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11898.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11898/head:pull/11898

PR: https://git.openjdk.org/jdk/pull/11898