[jdk23u] RFR: 8339248: RISC-V: Remove li64 macro assembler routine and related code

[duke]

On Tue, 3 Sep 2024 10:09:35 GMT, Gui Cao <gcao at openjdk.org> wrote:

> Hi, The same issue also exists in jdk23u. So I would like to backport [JDK-8339248](https://bugs.openjdk.org/browse/JDK-8339248) to jdk23u. with this patch ,it will save us some unnecessary runtime checks. This is a risc-v specific change. Backport is clean, risk is low.
> 
> ### Testing
> - [x] Run hotspot:tier1 tests on SOPHON SG2042 (fastdebug)

@zifeihan 
Your change (at version 13d59dd129c34cbc9cd695d912fc029996c2f703) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk23u/pull/90#issuecomment-2329187020