RFR: 8302790: Set FileMapRegion::mapped_base() to null if mapping fails [v3]

[Ioi Lam]

On Fri, 1 Dec 2023 21:56:29 GMT, Matias Saavedra Silva <matsaave at openjdk.org> wrote:

>> For cleanliness, we should reset FileMapRegion::mapped_base() to nullptr in case the mapping fails for any reasons. This patch moves the `set_mapped_base()` call after all the checks complete so it can remain as null in case checks fail. Verified with tier 1-5 tests.
>
> Matias Saavedra Silva 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 five additional commits since the last revision:
> 
>  - Merge branch 'master' into mapped_base_8302790
>  - Used consistent pattern
>  - Merge branch 'master' into mapped_base_8302790
>  - Moved assignment after checks
>  - 8302790: Set FileMapRegion::mapped_base() to null if mapping fails

LGTM!

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

Marked as reviewed by iklam (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/16866#pullrequestreview-1770597958