RFR: 8362515: RISC-V: cleanup NativeFarCall [v3]

[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:

  fix

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/26370/files
  - new: https://git.openjdk.org/jdk/pull/26370/files/1099e13a..f72db245

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26370&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26370&range=01-02

  Stats: 13 lines in 1 file changed: 0 ins; 5 del; 8 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