RFR: 8285437: riscv: Fix MachNode size mismatch for MacroAssembler::verify_oops*

[Fei Yang]

On Fri, 22 Apr 2022 07:26:54 GMT, Xiaolin Zheng <xlinzheng at openjdk.org> wrote:

> Trivial and same as [JDK-8283737](https://bugs.openjdk.java.net/browse/JDK-8283737): in fastdebug build, MacroAssembler::verify_oop is used in match rules encodeHeapOop and decodeHeapOop, which also requires a fixed length.
> 
> Logs are inside the JBS issue, and this issue could be reproduced by using `-XX:+VerifyOops`.
> 
> Tested using `-XX:+VerifyOops` and a hotspot tier1 on qemu.
> 
> Thanks,
> Xiaolin

PS: Could you please add some code comment like fix for [JDK-8283737](https://bugs.openjdk.java.net/browse/JDK-8283737) ?
I can sponsor after that.

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PR: https://git.openjdk.java.net/jdk/pull/8356