RFR: 8343430: RISC-V: C2: Remove old trampoline call [v4]

[Hamlin Li]

On Tue, 5 Nov 2024 02:38:46 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> Hi, please consider this cleanup change.
>> 
>> The old trampoline call on linux-riscv64 is disabled by default after: https://bugs.openjdk.org/browse/JDK-8332689.
>> And the new solution (load target address from stub and call) has been baked in jdk master for quite some time.
>> This propose to remove the old trampoline call related logic so that the code will be cleaner and easier to maintain.
>> As we are still using `trampoline_stub_Relocation` for the stub, I kept using the original `emit_trampoline_stub` name.
>> 
>> Testing on linux-riscv64:
>> - [x] tier1-tier3 (release)
>> - [x] hotspot:tier1 (fastdebug)
>
> Fei Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Minor

Looks good. Thanks.

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Marked as reviewed by mli (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/21822#pullrequestreview-2415297164