RFR: 8300255: Introduce interface for GC oop verification in the assembler [v3]

[Coleen Phillimore]

On Wed, 8 Feb 2023 10:19:20 GMT, Erik Österlund <eosterlund at openjdk.org> wrote:

>> In the assembly code, there is some generic oop verification code. Said verification may or may not fit a particular GC. In particular, it has not worked well for ZGC for a while, and there is an if (UseZGC). This enhancement aims at generalizing this code, such that a collector can have its own oop verification policy.
>
> Erik Österlund has updated the pull request incrementally with one additional commit since the last revision:
> 
>   RISC-V fixes

Tier8 is unnecessary as you've done general testing with it.

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PR: https://git.openjdk.org/jdk/pull/12443