[foreign-memaccess] RFR: Merge master [v2]

[J.Duke]

> Hi all,
> 
> this is an _automatically_ generated pull request to notify you that there are 93 commits from the branch `master`that can **not** be merged into the branch `foreign-memaccess`:
> 
> Over 25 files contains merge conflicts.
> 
> All Committers in this [project](https://openjdk.java.net/census#panama) have access to my [personal fork](https://github.com/openjdk-bot/panama-foreign) and can therefore help resolve these merge conflicts (you may want to coordinate who should do this).
> The following paragraphs will give an example on how to solve these merge conflicts and push the resulting merge commit to this pull request.
> The below commands should be run in a local clone of your [personal fork](https://wiki.openjdk.java.net/display/skara#Skara-Personalforks) of the [openjdk/panama-foreign](https://github.com/openjdk/panama-foreign) repository.
> 
> # Ensure target branch is up to date
> $ git checkout foreign-memaccess
> $ git pull https://github.com/openjdk/panama-foreign.git foreign-memaccess
> 
> # Fetch and checkout the branch for this pull request
> $ git fetch https://github.com/openjdk-bot/panama-foreign.git +73:openjdk-bot-73
> $ git checkout openjdk-bot-73
> 
> # Merge the target branch
> $ git merge foreign-memaccess
> 
> When you have resolved the conflicts resulting from the `git merge` command above, run the following commands to create a merge commit:
> 
> $ git add paths/to/files/with/conflicts
> $ git commit -m 'Merge master'
> 
> 
> When you have created the merge commit, run the following command to push the merge commit to this pull request:
> 
> $ git push https://github.com/openjdk-bot/panama-foreign.git openjdk-bot-73:73
> 
> _Note_: if you are using SSH to push commits to GitHub, then change the URL in the above `git push` command accordingly.
> 
> Thanks,
> J. Duke

J. Duke 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 424 additional commits since the last revision:

 - Fix spurious leftover changes
 - Merge branch 'foreign-memaccess' into openjdk-bot-73
 - Automatic merge of master into foreign-memaccess
 - Merge master
 - Add benchmark for floating point memory access var handle performance
   
   Reviewed-by: jvernee, psandoz
 - Automatic merge of master into foreign-memaccess
 - Merge master
 - 8254343: Revisit API for supporting mapped memory segments
   
   Reviewed-by: psandoz
 - Automatic merge of master into foreign-memaccess
 - 8253937: Simplify support for shared memory segment
   
   Reviewed-by: psandoz
 - ... and 414 more: https://git.openjdk.java.net/panama-foreign/compare/fcfeafad...0be67a29

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

Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/393/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/393/files/fcfeafad..0be67a29

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=393&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=393&range=00-01

  Stats: 136 lines in 2 files changed: 131 ins; 3 del; 2 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/393.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/393/head:pull/393

PR: https://git.openjdk.java.net/panama-foreign/pull/393