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

[Ludovic Henry]

On Thu, 29 Aug 2024 12:59:40 GMT, Fei Yang <fyang at openjdk.org> wrote:

> The macro assembler routine li64 and related code (is_li64_at, patch_imm_in_li64, get_target_of_li64 and check_li64_data_dependency) is unused for now. We should remove these unused code, which will save us some unnecessary runtime checks. We can add them back when needed again someday.
> 
> Testing:
> - [x] release & fastdebug build
> - [x] Gtest & Tier1 test (release)

Marked as reviewed by luhenry (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/20769#pullrequestreview-2272978689