[foreign-memaccess+abi] RFR: 8299736: Drop VaList

Fri Jan 6 13:20:06 UTC 2023

This patch removes VaList from the FFM API, as discussed here:
https://mail.openjdk.org/pipermail/panama-dev/2022-November/018096.html 

This patch also removes all the implementation internals, as well as any test and microbenchmarks referring to VaList.

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

Commit messages:
 - Remove VaList

Changes: https://git.openjdk.org/panama-foreign/pull/763/files
 Webrev: https://webrevs.openjdk.org/?repo=panama-foreign&pr=763&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299736
  Stats: 3395 lines in 20 files changed: 0 ins; 3388 del; 7 mod
  Patch: https://git.openjdk.org/panama-foreign/pull/763.diff
  Fetch: git fetch https://git.openjdk.org/panama-foreign pull/763/head:pull/763

PR: https://git.openjdk.org/panama-foreign/pull/763