RFR: 8302289: RISC-V: Use bgez instruction in arraycopy_simple_check when possible

[Gui Cao]

Refer to src/hotspot/cpu/s390/c1_LIRAssembler_s390.cpp, because Klass::_lh_neutral_value is always 0, we can use bgez here instead of the combination of mv and bge.

## Testing:
- all tier1 on unmatched board without new failures

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

Commit messages:
 - Merge branch 'master' into JDK-8302289
 - Merge branch 'master' into optimize_bgez
 - Optimize code with bgez

Changes: https://git.openjdk.org/jdk/pull/12525/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12525&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8302289
  Stats: 5 lines in 1 file changed: 1 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/12525.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12525/head:pull/12525

PR: https://git.openjdk.org/jdk/pull/12525