[riscv-port-jdk11u:riscv-port] RFR: 8294087: RISC-V: RVC: Fix a potential alignment issue and add more alignment assertions for the patchable calls/nops

[Dingli Zhang]

On Mon, 14 Oct 2024 03:25:45 GMT, Dingli Zhang <dzhang at openjdk.org> wrote:

> Hi,
> Please help review this backport to riscv-port-jdk11u.
> 
> Backport of [JDK-8294087](https://bugs.openjdk.org/browse/JDK-8294087).
> 
> The original patch cannot be directly applied because of riscv-port-jdk11u do not have `emit_entry_barrier_stub ` C2CodeStub and no [JDK-8216557](https://bugs.openjdk.org/browse/JDK-8216557).
> 
> Testing:
> - Tier1 passed without new failure on lp4a (release).

Thanks to Gui Cao for the original patch.

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PR Comment: https://git.openjdk.org/riscv-port-jdk11u/pull/40#issuecomment-2409873237