[foreign-memaccess] RFR: Merge master

[J.Duke]

Hi all,

this is an _automatically_ generated pull request to notify you that there are 105 commits from the branch `master`that
can **not** be merged into the branch `foreign-memaccess`:

The following files contains merge conflicts:

- src/jdk.incubator.foreign/share/classes/jdk/incubator/foreign/MemoryHandles.java
- src/jdk.incubator.foreign/share/classes/jdk/incubator/foreign/MemorySegment.java
- src/jdk.incubator.foreign/share/classes/jdk/internal/foreign/MappedMemorySegmentImpl.java
- test/micro/org/openjdk/bench/jdk/incubator/foreign/TestAdaptVarHandles.java

All Committers in this [project](https://openjdk.java.net/census#Optional[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 foreign-memaccess

# Fetch and checkout the branch for this pull request
$ git fetch https://github.com/openjdk-bot/panama-foreign +41:openjdk-bot-41
$ git checkout openjdk-bot-41

# 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 openjdk-bot-41:41

_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

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

Commit messages:
 - Merge remote-tracking branch 'remotes/jdk/master'
 - Added tag jdk-15+26 for changeset 0a32396f7a69
 - 8246397: Use KnownOIDs for known OIDs
 - 8245283: JFR: Can't handle constant dynamic used by Jacoco agent
 - 8246260: JFR: Write event size field without padding
 - 8246451: Reduce overhead of normalizing file paths with trailing slash
 - 8246458: Shenandoah: TestAllocObjects.java test fail with -XX:+ShenandoahVerify
 - 8246095: Tweaks to memory access API
 - 8238763: ObjectInputStream readUnshared method handling of Records
 - 8244278: Excessive code cache flushes and sweeps
 - ... and 95 more: https://git.openjdk.java.net/panama-foreign/compare/ccb9dfe9...21e979f2

The webrev contains the conflicts with foreign-memaccess:
 - merge conflicts: https://webrevs.openjdk.java.net/panama-foreign/194/webrev.00.conflicts

Changes: https://git.openjdk.java.net/panama-foreign/pull/194/files
  Stats: 21190 lines in 863 files changed: 15779 ins; 2281 del; 3130 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/194.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/194/head:pull/194

PR: https://git.openjdk.java.net/panama-foreign/pull/194