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

[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.

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Commit messages:
 - Close files opened by Decoder before checkpoint

Changes: https://git.openjdk.org/crac/pull/116/files
 Webrev: https://webrevs.openjdk.org/?repo=crac&pr=116&range=00
  Stats: 79 lines in 4 files changed: 79 ins; 0 del; 0 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