RFR: JDK-8295859: Update Manual Test Groups [v3]

[Bill Huang]

> This task is created to add manual tests to the manual test groups.
> 
> In addition, fix is provided for TestMatrix.java#Downcall-F and TestMatrix.java#Downcall-T which are failing due to missing TestDowncall.java ([JDK-8287158](https://bugs.openjdk.org/browse/JDK-8287158)).

Bill Huang has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:

 - Merge master
 - Merge branch 'master' into JDK-8295859
 - Updated Manual Test Groups

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Changes: https://git.openjdk.org/jdk/pull/10864/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10864&range=02
  Stats: 14 lines in 1 file changed: 13 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10864.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10864/head:pull/10864

PR: https://git.openjdk.org/jdk/pull/10864