[crac] RFR: Drop perfdata and cppath [v3]

[Radim Vansa]

> Storing PerfMemory contents into file might be fragile; if the file is corrupted (e.g. due to wrong permissions) JVM might receive SIGBUS when updating performance counters after restore.
> This commit provides alternate solution, moving the shared file-mapped memory into private anonymous memory during C/R.

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

  Remove forgotten global variable

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Changes:
  - all: https://git.openjdk.org/crac/pull/119/files
  - new: https://git.openjdk.org/crac/pull/119/files/bd6adcc8..bc8cf838

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=119&range=02
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=119&range=01-02

  Stats: 67 lines in 1 file changed: 36 ins; 9 del; 22 mod
  Patch: https://git.openjdk.org/crac/pull/119.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/119/head:pull/119

PR: https://git.openjdk.org/crac/pull/119