RFR: 8362515: RISC-V: cleanup NativeFarCall [v5]

[Hamlin Li]

> Hi,
> Can you help to review this patch?
> 
> By https://github.com/openjdk/jdk/blob/master/src/hotspot/cpu/riscv/macroAssembler_riscv.hpp#L1270, there are far call, indirect call, reloc call.
> NativeFarCall is in fact a reloc call, the name is confusing, better to rename it to RelocCall.
> Also add some comments and do some other simple cleanup.
> 
> Thanks!

Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:

  comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26370/files
  - new: https://git.openjdk.org/jdk/pull/26370/files/37820220..724c44d2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26370&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26370&range=03-04

  Stats: 3 lines in 2 files changed: 0 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/26370.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26370/head:pull/26370

PR: https://git.openjdk.org/jdk/pull/26370