RFR: 8294187: RISC-V: Unify all relocations for the backend into AbstractAssembler::relocate() [v2]

[Xiaolin Zheng]

On Fri, 23 Sep 2022 11:56:27 GMT, Xiaolin Zheng <xlinzheng at openjdk.org> wrote:

>> Unify all relocations into AbstractAssembler::relocate() as a simple cleanup.
>> 
>> Tested hotspot tier1 and tier2 on QEMU.
>
> Xiaolin Zheng has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Migrate them to the next patch for AbstractAssembler has their counterparts
>  - Remove useless add_debug_info_for_branch(adr, CodeEmitInfo*)

Thank you all for the review!

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PR: https://git.openjdk.org/jdk/pull/10384