RFR: 8337713: RISC-V: fix typos in macroAssembler_riscv.cpp

[SendaoYan]

Hi all,
  This PR fix some typos bugs for RISC-V, and a typo bug in test directory. Trivial fix, no risk.

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Commit messages:
 - 8337713: RISC-V: fix typos in macroAssembler_riscv.cpp

Changes: https://git.openjdk.org/jdk/pull/21368/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21368&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8337713
  Stats: 5 lines in 3 files changed: 0 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/21368.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21368/head:pull/21368

PR: https://git.openjdk.org/jdk/pull/21368