[jdk17u-dev] RFR: 8286312: Stop mixing signed and unsigned types in bit operations

[Aleksey Shipilev]

Clean backport to improve Atomics reliability in JDK 17u. The fix accrued no bug tail for 1.5 years.

Additional testing:
 - [x] macos-aarch64-server-fastdebug, `Atomic` gtests

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Commit messages:
 - Backport 39f4434f44d46548917926c7a802b046197bbe33

Changes: https://git.openjdk.org/jdk17u-dev/pull/2060/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2060&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8286312
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2060.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2060/head:pull/2060

PR: https://git.openjdk.org/jdk17u-dev/pull/2060