RFR: JDK-8302320: AsyncGetCallTrace obtains too few frames in sanity test [v2]

[Johannes Bechberger]

> Fixes the issue by applying a fix that is already implemented in PPC.

Johannes Bechberger has updated the pull request incrementally with one additional commit since the last revision:

  Implement addptr suggestion by @JohnVernee and @reinrich

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/12535/files
  - new: https://git.openjdk.org/jdk/pull/12535/files/b32cf7c0..e63ab44a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12535&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12535&range=00-01

  Stats: 7 lines in 3 files changed: 4 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/12535.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12535/head:pull/12535

PR: https://git.openjdk.org/jdk/pull/12535