[crac] RFR: Register CallSite cleaners with higher priority

[Radim Vansa]

Cleaners for CallSites cannot be registered with regular CLEANERS priority as this would hang/throw exceptions any time a lambda or method reference is used during or after processing this resource priority class; therefore we postpone as the last priority.

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Commit messages:
 - Register CallSite cleaners with higher priority

Changes: https://git.openjdk.org/crac/pull/66/files
 Webrev: https://webrevs.openjdk.org/?repo=crac&pr=66&range=00
  Stats: 21 lines in 4 files changed: 17 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/crac/pull/66.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/66/head:pull/66

PR: https://git.openjdk.org/crac/pull/66