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

[Jorn Vernee]

> 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

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Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/629/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/629/files/8269cbd3..329cf54e

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=629&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=629&range=01-02

  Stats: 19 lines in 1 file changed: 0 ins; 0 del; 19 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/629.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/629/head:pull/629

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