[foreign-abi] RFR: Rename SystemABI to ForeignLinker, and move C support to a separate class.

[Jorn Vernee]

On Mon, 18 May 2020 11:58:00 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> In the end, perhaps this is tied with the support class called just `C`; e.g. `C.C_Bool` looks a tad weird,
> `C<something>.C_BOOL` (e.g. `CSupport.C_BOOL`) perhaps not as much.

I agree, it doesn't look as weird after applying the rename to CSupport locally.

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PR: https://git.openjdk.java.net/panama-foreign/pull/174