[crac] RFR: Close files opened by Decoder before checkpoint [v2]

[Radim Vansa]

> Native memory tracking needs to resolve some addresses for stack unwinding and the decoders keep some shared library files open as a cache. Since the decoder instances can be re-allocated anytime this fix just destroys them before a checkpoint.

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

  Assume error handler decoder is null during checkpoint

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Changes:
  - all: https://git.openjdk.org/crac/pull/116/files
  - new: https://git.openjdk.org/crac/pull/116/files/f2e99a2d..ee544fc8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=116&range=01
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=116&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 3 del; 1 mod
  Patch: https://git.openjdk.org/crac/pull/116.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/116/head:pull/116

PR: https://git.openjdk.org/crac/pull/116