[lambda-leftovers] RFR: Merge master [v2]

[J.Duke]

> Hi all,
> 
> this is an _automatically_ generated pull request to notify you that there are 10 commits from the branch `master`that can **not** be merged into the branch `lambda-leftovers`:
> 
> The following file contains merge conflicts:
> 
> - test/langtools/tools/javac/lambda/UnderscoreAsIdent.java
> 
> All Committers in this [project](https://openjdk.java.net/census#amber) have access to my [personal fork](https://github.com/openjdk-bot/amber) 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/amber](https://github.com/openjdk/amber) repository.
> 
> # Ensure target branch is up to date
> $ git checkout lambda-leftovers
> $ git pull https://github.com/openjdk/amber.git lambda-leftovers
> 
> # Fetch and checkout the branch for this pull request
> $ git fetch https://github.com/openjdk-bot/amber.git +78:openjdk-bot-78
> $ git checkout openjdk-bot-78
> 
> # Merge the target branch
> $ git merge lambda-leftovers
> 
> 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/amber.git openjdk-bot-78:78
> 
> _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 incrementally with 207 additional commits since the last revision:

 - 8259350: Add some internal debugging APIs to the debug agent
   
   Reviewed-by: sspitsyn, amenkov
 - 8259278: Optimize Vector API slice and unslice operations
   
   Reviewed-by: psandoz, vlivanov
 - 8255019: Shenandoah: Split STW and concurrent mark into separate classes
   
   Reviewed-by: rkennke, shade
 - 8258956: Memory Leak in StringCoding on ThreadLocal resultCached StringCoding.Result
   
   Reviewed-by: rriggs, alanb
 - 8253866: Security Libs Terminology Refresh
   
   Reviewed-by: erikj, weijun, mullan
 - 8259727: Remove redundant "target" arguments to methods in Links
   
   Reviewed-by: hannesw
 - 8259723: Move Table class to formats.html package
   
   Reviewed-by: hannesw
 - 8258912: Remove JVM options CountJNICalls and CountJVMCalls
   
   Reviewed-by: coleenp, lfoltan, shade
 - 8226416: MonitorUsedDeflationThreshold can cause repeated async deflation requests
   
   Reviewed-by: dholmes, coleenp
 - 8259699: Reduce char[] copying in URLEncoder.encode(String, Charset)
   
   Reviewed-by: attila, redestad, chegar
 - ... and 197 more: https://git.openjdk.java.net/amber/compare/f5ee3565...d18d26e8

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

Changes:
  - all: https://git.openjdk.java.net/amber/pull/75/files
  - new: https://git.openjdk.java.net/amber/pull/75/files/f5ee3565..d18d26e8

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=amber&pr=75&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=amber&pr=75&range=00-01

  Stats: 40134 lines in 1211 files changed: 16015 ins; 11783 del; 12336 mod
  Patch: https://git.openjdk.java.net/amber/pull/75.diff
  Fetch: git fetch https://git.openjdk.java.net/amber pull/75/head:pull/75

PR: https://git.openjdk.java.net/amber/pull/75