[riscv-port-jdk11u:riscv-port] RFR: 8293050: RISC-V: Remove redundant non-null assertions about macro-assembler

[duke]

On Wed, 18 Sep 2024 01:15:31 GMT, Dingli Zhang <dzhang at openjdk.org> wrote:

> Please review this backport to riscv-port-jdk17u.
> Backport of [JDK-8293050](https://bugs.openjdk.org/browse/JDK-8293050).
> Applies not cleanly due to context difference, but it is easy to resolve them manually.
> 
> Testing:
> - Tier1 passed without new failure on unmatched (release).

@DingliZhang 
Your change (at version eb3986c70c227e80e61da3a4b7e3440a7cd6234d) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/riscv-port-jdk11u/pull/32#issuecomment-2358472455