[crac] RFR: Fix ordering of invocation on Resources [v8]

[Radim Vansa]

> * keeps the original handling of exceptions: afterRestore is called even if beforeCheckpoint throws
> * allows to register a resource in a context that did not start beforeCheckpoint invocations yet
> * registering resource in previous/running context fails the checkpoint but does not trigger exception immediately
>    * instead this will be one of the recorded exceptions and the resource has a chance to fire next time
> * allowed registration of resources can be invoked from other thread without deadlock; illegal registration can deadlock, though

Radim Vansa has updated the pull request incrementally with one additional commit since the last revision:

  Revert API change, force blocking registration

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

Changes:
  - all: https://git.openjdk.org/crac/pull/60/files
  - new: https://git.openjdk.org/crac/pull/60/files/729a4537..868baeae

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=60&range=07
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=60&range=06-07

  Stats: 338 lines in 8 files changed: 168 ins; 88 del; 82 mod
  Patch: https://git.openjdk.org/crac/pull/60.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/60/head:pull/60

PR: https://git.openjdk.org/crac/pull/60