RFR: 8331399: RISC-V: Don't us mv instead of la

[Robbin Ehn]

Hi please consider,

It makes no sense to use mv instead of la.
It doesn't follow the standard mnemonics and it confusing when people use mv when they really mean la.

la will do the reloc with movptr in this case, so the code is the same.

Testing t1.

Thanks, Robbin

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Commit messages:
 - Use la()

Changes: https://git.openjdk.org/jdk/pull/19014/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19014&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8331399
  Stats: 9 lines in 2 files changed: 0 ins; 7 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/19014.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19014/head:pull/19014

PR: https://git.openjdk.org/jdk/pull/19014