RFR: 8319541: G1: Rename g1EvacFailure.?pp

[Thomas Schatzl]

Hi,

  please review this change that properly names the `g1EvacFailure.?pp` files according to the single class in the file.

Testing: local compilation

Thanks,
  Thomas

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Commit messages:
 - 8319541-remove-g1evacfailure-files

Changes: https://git.openjdk.org/jdk/pull/16522/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16522&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319541
  Stats: 124 lines in 4 files changed: 61 ins; 61 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/16522.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16522/head:pull/16522

PR: https://git.openjdk.org/jdk/pull/16522