RFR: 8307150: RISC-V: Remove remaining StoreLoad barrier with UseCondCardMark for Serial/Parallel GC

[Feilong Jiang]

Hi, 

can I have reviews for this change that removes the remaining StoreLoad barrier for RISC-V port in `CardTableBarrierSetAssembler::store_check` just like [JDK-8261309](https://bugs.openjdk.org/browse/JDK-8261309) did?

After the removal of CMS, this barrier is no longer needed.

Thanks.

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Commit messages:
 - RISC-V: Remove remaining StoreLoad barrier with UseCondCardMark for Serial/Parallel GC

Changes: https://git.openjdk.org/jdk/pull/13739/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13739&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307150
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13739.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13739/head:pull/13739

PR: https://git.openjdk.org/jdk/pull/13739