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

[Johannes Bechberger]

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

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Commit messages:
 - Fix typo in ARM change
 - Fix ASGCT sanity test
 - Check more frames in ASGCT sanity test

Changes: https://git.openjdk.org/jdk/pull/12535/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12535&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8302320
  Stats: 37 lines in 3 files changed: 33 ins; 0 del; 4 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