RFR: 8288105: [PPC64] Problems with -XX:+VerifyStack [v4]

[Martin Doerr]

> Deoptimization and uncommon trap stubs require last Java PC to point to a PC which has an appropriate OopMap. Otherwise, -XX:+VerifyStack does no longer work after [JDK-8284161](https://bugs.openjdk.org/browse/JDK-8284161).
> I had to debug through the frame stuff and I made the code a bit more robust and easier to use and debug.

Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:

  Add comment.

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Changes:
  - all: https://git.openjdk.org/jdk19/pull/3/files
  - new: https://git.openjdk.org/jdk19/pull/3/files/63dc3c61..120c2b1c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk19&pr=3&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk19&pr=3&range=02-03

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk19/pull/3.diff
  Fetch: git fetch https://git.openjdk.org/jdk19 pull/3/head:pull/3

PR: https://git.openjdk.org/jdk19/pull/3