[foreign-memaccess+abi] RFR: 8277845: Clean up use if ProgrammableInvoker/UpcallHandler.USE_INTRINSICS in tests. [v3]

[Jorn Vernee]

On Mon, 10 Jan 2022 18:33:39 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> This PR cleans up use of USE_INTRINSICS flags in the tests, which was removed a while ago.
>> 
>> I also noticed that TestMatrix.java didn't have a copyright header, so I've added one. (the diff looks a little mangled as a result). It also wasn't setting the UPCALL_TEST_TYPE flag when running TestUpcall, so I've added that flag.
>
> Jorn Vernee has updated the pull request incrementally with one additional commit since the last revision:
> 
>   re-add /manual which was dropped by accident

Addressed in the latest commit:

- Move loadLibrary calls to base classes.
- Make static fields only used in the base class `private`.
- Capitalize static field names.

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PR: https://git.openjdk.java.net/panama-foreign/pull/629