[foreign-abi] RFR: 8233007: Add upcall tests that test stack arguments on Windows [v2]

[Jorn Vernee]

> Hi,
> 
> This PR adds a test for high-arity upcalls.
> 
> This actually uncovered a bug in the Windows CallArranger wrt passing structs by-value on the stack, which I've fixed.
> I've also added the particular test case to the CallArranger test.
> Thanks,
> Jorn

Jorn Vernee has updated the pull request with a new target base due to a merge or a rebase. The pull request now
contains one commit:

  Add a test for high-arity upcalls

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Changes: https://git.openjdk.java.net/panama-foreign/pull/342/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=342&range=01
  Stats: 297 lines in 6 files changed: 267 ins; 29 del; 1 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/342.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/342/head:pull/342

PR: https://git.openjdk.java.net/panama-foreign/pull/342