RFR: Loom: RISCV stubs

[Alan Bateman]

On Fri, 15 Apr 2022 09:02:06 GMT, Fei Yang <fyang at openjdk.org> wrote:

> RISCV64 port has been upstreamed recently. This makes compile on Linux RISCV64 platform.
> Note current patch does not implement Loom on this platform, but merely provides the absolute basic build capabilities.
> 
> Additional testing:
> Linux RISCV64 cross-compilation

Thanks for this, it's okay to include this port. I assume you'll keep it up to date.

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Marked as reviewed by alanb (Committer).

PR: https://git.openjdk.java.net/loom/pull/150