RFR: 8303810: Move attribute of FileMapInfo::fail_stop to match JDK-8302124 [v2]

[Julian Waters]

> Cleanup of [JDK-8292269](https://bugs.openjdk.org/browse/JDK-8292269) to move an attribute missed in it to match the HotSpot Style Guide's required attribute position

Julian Waters has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'openjdk:master' into patch-8
 - 8303810: Move attribute of FileMapInfo::fail_stop to match JDK-8302124

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/12918/files
  - new: https://git.openjdk.org/jdk/pull/12918/files/2ad173da..e9083a2e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12918&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12918&range=00-01

  Stats: 3187 lines in 105 files changed: 2446 ins; 435 del; 306 mod
  Patch: https://git.openjdk.org/jdk/pull/12918.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12918/head:pull/12918

PR: https://git.openjdk.org/jdk/pull/12918