RFR: 8319571: Update jni/nullCaller/NullCallerTest.java to accept flags or mark as flagless [v2]

[Tim Prinzing]

> Marked as flagless.

Tim Prinzing has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:

 - use ProcessTools helper class to run test.
 - Merge branch 'master' into JDK-8319571
 - Merge branch 'master' into JDK-8319571
 - 8319571: Update jni/nullCaller/NullCallerTest.java to accept flags or mark as flagless
   
   Marked as flagless.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16711/files
  - new: https://git.openjdk.org/jdk/pull/16711/files/bbcbb810..b947469b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16711&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16711&range=00-01

  Stats: 12689 lines in 337 files changed: 6298 ins; 3150 del; 3241 mod
  Patch: https://git.openjdk.org/jdk/pull/16711.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16711/head:pull/16711

PR: https://git.openjdk.org/jdk/pull/16711