RFR: Fix recent merge errors

[Aleksey Shipilev]

I skipped through current premain-vs-mainline webrev, and noticed a few merge errors.

`metaspaceShared.cpp` hunks are obvious duplications. I removed the lines that are actually different from mainline.

`compilationPolicy.hpp` hunk is a leftover from AOT Profiling. I remember pointing this out to @veresov during mainline review, and we went into mainline without that extra `notify_all`. We should ditch it in premain too.

Additional testing:
 - [x] Linux x86_64 server fastdebug, `runtime/cds`

-------------

Commit messages:
 - Fix

Changes: https://git.openjdk.org/leyden/pull/72/files
  Webrev: https://webrevs.openjdk.org/?repo=leyden&pr=72&range=00
  Stats: 4 lines in 2 files changed: 0 ins; 4 del; 0 mod
  Patch: https://git.openjdk.org/leyden/pull/72.diff
  Fetch: git fetch https://git.openjdk.org/leyden.git pull/72/head:pull/72

PR: https://git.openjdk.org/leyden/pull/72