RFR: 8293050: RISC-V: Remove redundant non-null assertions about macro-assembler [v2]

[Aleksey Shipilev]

On Wed, 31 Aug 2022 09:23:14 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> There are some non-null assertions about macro-assembler in riscv-specific code. Most of them are there to make some internal code-check tools happy. We should remove those redundant assertions to make the code clean.
>> 
>> Tested with tier1 hotspot on linux-riscv64 unmatched.
>
> Fei Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix

Marked as reviewed by shade (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/10079