RFR: 8361504: RISC-V: Make C1 clone intrinsic platform guard more specific

[Feilong Jiang]

Hi all.
Please review this trivial patch, which changes the C1 primitive array clone intrinsic RISCV platform guard into RISCV64. As we only support RISCV64 for now.

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Commit messages:
 - RISC-V: Make C1 clone intrinsic macro guard more accurate

Changes: https://git.openjdk.org/jdk/pull/26161/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26161&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8361504
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/26161.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26161/head:pull/26161

PR: https://git.openjdk.org/jdk/pull/26161