RFR: 8282900: runtime/stringtable/StringTableCleaningTest.java verify unavailable at this moment [v2]

[Robbin Ehn]

> Hi, please consider:
> 
> verify() is called by GC in safepoint so it should use the corresponding scanning method.
> verify_and_compare_entries() can wait for until there is no resize.
> 
> This makes these methods always succeed, passes t1-t6.

Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:

  Fixed review comments

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/10527/files
  - new: https://git.openjdk.org/jdk/pull/10527/files/29e957c4..2861af72

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10527&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10527&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/10527.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10527/head:pull/10527

PR: https://git.openjdk.org/jdk/pull/10527