RFR: 8273927: Enable hsdis for riscv64

[Aleksey Shipilev]

On Fri, 17 Sep 2021 08:38:09 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Currently compiled `hsdis-riscv64.so` binary complains:
> 
> 
> hsdis: bad native mach=architecture not set in Makefile!; please port hsdis to this platform
> 
> 
> It seems to be as simple as point to the right BFD arch.
> 
> Additional testing:
>  - [x] Linux RISC-V port, `-XX:+PrintAssembly` works

Thanks!

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PR: https://git.openjdk.java.net/jdk/pull/5558