RFR: 8301874: BarrierSetC2 should assign barrier data to stores

[Erik Österlund]

BarrierSetC2 should assign barrier data to stores, like it does for loads and atomics. That way, a GC that uses barrier data for stores, can call the super class to generate the loads/stores, instead of copying that code.

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Commit messages:
 - 8301874: BarrierSetC2 should assign barrier data to stores

Changes: https://git.openjdk.org/jdk/pull/12442/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12442&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8301874
  Stats: 4 lines in 1 file changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/12442.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12442/head:pull/12442

PR: https://git.openjdk.org/jdk/pull/12442