Remove the post barriers when clearing a flat field / element. All contained oops will be null, no cards need to be dirtied.
------------- Commit messages: - 8378523: [lworld] Remove post-barriers from CardTableBarrierSet value_store_null_in_heap Changes: https://git.openjdk.org/valhalla/pull/2199/files Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2199&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8378523 Stats: 8 lines in 1 file changed: 0 ins; 7 del; 1 mod Patch: https://git.openjdk.org/valhalla/pull/2199.diff Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2199/head:pull/2199 PR: https://git.openjdk.org/valhalla/pull/2199
