RFR: 8257882: Implement linkToNative intrinsic on AArch64 [v2]

[Andrew Haley]

On Thu, 10 Dec 2020 10:25:33 GMT, Nick Gasson <ngasson at openjdk.org> wrote:

>> push_fp() doesn't make much sense if the RegSet is a set of Registers, which are by definition not FloatRegisters. That casting of Register to FloatRegister in gc/z is evil.
>
> Should we have a separate RegSet type for FloatRegisters to avoid mixing them up?

Absolutely. I'd make an AbstractRegSet and use it as a base type
for both RegSet and FloatRegSet, then we can get rid of the casts
altogether.

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PR: https://git.openjdk.java.net/jdk/pull/1711