RFR: 8273492: Move evacuation failure handling into G1YoungCollector

[Thomas Schatzl]

Hi all,

  can I have reviews for this change that moves young gc evacuation failure handling (`G1EvacFailureRegions`) from `G1CollectedHeap` to `G1YoungCollector`.

Testing: tier1-3

Thanks,
  Thomas

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Commit messages:
 - Move evac failure handling to young gc

Changes: https://git.openjdk.java.net/jdk/pull/5419/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5419&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273492
  Stats: 161 lines in 13 files changed: 57 ins; 48 del; 56 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5419.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5419/head:pull/5419

PR: https://git.openjdk.java.net/jdk/pull/5419