[crac] RFR: Fix ordering of invocation on Resources [v9]

[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:

  Update docs

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Changes:
  - all: https://git.openjdk.org/crac/pull/60/files
  - new: https://git.openjdk.org/crac/pull/60/files/868baeae..9e81179f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=60&range=08
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=60&range=07-08

  Stats: 16 lines in 4 files changed: 10 ins; 2 del; 4 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