[riscv-port-jdk17u:riscv-port] RFR: 8302289: RISC-V: Use bgez instruction in arraycopy_simple_check when possible

[Gui Cao]

Hi,
Please help review this backport to riscv-port-jdk17u.
Backport of [JDK-8302289](https://bugs.openjdk.org/browse/JDK-8302289). Applies cleanly.

Testing:

Tier1-3 passed without new failure on unmacthed (release).

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Commit messages:
 - backport 8302289: RISC-V: Use bgez instruction in arraycopy_simple_check when possible

Changes: https://git.openjdk.org/riscv-port-jdk17u/pull/64/files
 Webrev: https://webrevs.openjdk.org/?repo=riscv-port-jdk17u&pr=64&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/riscv-port-jdk17u/pull/64.diff
  Fetch: git fetch https://git.openjdk.org/riscv-port-jdk17u.git pull/64/head:pull/64

PR: https://git.openjdk.org/riscv-port-jdk17u/pull/64