RFR: 8343430: RISC-V: C2: Remove old trampoline call

[Robbin Ehn]

On Fri, 1 Nov 2024 12:08:58 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)

Can we change the name to something like address or far address stub?

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PR Comment: https://git.openjdk.org/jdk/pull/21822#issuecomment-2454392816