This is a port of 8369979 for PPC. It allows to calculate caller SP from `CodeBlob` for continuation stub. It also enables the test `test/hotspot/jtreg/serviceability/sa/TestJhsdbJstackWithVirtualThread.java` for PPC.
------------- Commit messages: - 8370240: [PPC64] jhsdb jstack cannot handle continuation stub Changes: https://git.openjdk.org/jdk/pull/27902/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27902&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8370240 Stats: 17 lines in 2 files changed: 15 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/27902.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/27902/head:pull/27902 PR: https://git.openjdk.org/jdk/pull/27902
