[foreign-abi] RFR: 8251047: GC stackwalking doesn't work when intrinsics are enabled (followup)

[Jorn Vernee]

Hi,

This PR is a followup on the earlier https://github.com/openjdk/panama-foreign/pull/279 PR. It adds a jtreg test that
stresses the problematic stack walking fixed in the previous PR, and in particular the use-case that was failing.

This relies on a new WhiteBox API to manually (and reliably) trigger stack frame walking and verification.

Thanks,
Jorn

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Commit messages:
 - Add a stack walk test

Changes: https://git.openjdk.java.net/panama-foreign/pull/294/files
 Webrev: https://webrevs.openjdk.java.net/panama-foreign/294/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8251047
  Stats: 160 lines in 4 files changed: 160 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/294.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/294/head:pull/294

PR: https://git.openjdk.java.net/panama-foreign/pull/294