RFR: 8366671: Refactor Thread::SpinAcquire and Thread::SpinRelease

[Anton Artemov]

Hi, 

please consider the following changes:

In this PR `Thread::SpinAcquire()` and `Thread::SpinRelease()` methods are refactored into a utility class `SpinCriticalSection`. The motivation is to make it easier for developers to use this lightweight synchronization mechanism in the codebase. The two aforementioned methods were used in JFR to create short critical sections with a helper class, but that was not the case for the object monitor code. 

Additionally, `SpinSingleSection` class is added, which allows to execute a payload code inside of a functor by only one thread. 

Tested in tiers 1 - 5.

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Commit messages:
 - Merge remote-tracking branch 'origin/master' into JDK-8366671-refactor-spin-acquire-spin-release
 - 8366671: Fixed whitespaces.
 - 8366671: Fixed whitespaces.
 - 8366671: Fixed whitespaces.
 - 8366671: Refactor SpinAcquire/SpinRelease into SpinCriticalSection

Changes: https://git.openjdk.org/jdk/pull/28264/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28264&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366671
  Stats: 380 lines in 12 files changed: 199 ins; 116 del; 65 mod
  Patch: https://git.openjdk.org/jdk/pull/28264.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28264/head:pull/28264

PR: https://git.openjdk.org/jdk/pull/28264