Experiments with C ABI calls

[Andrew Haley]

I'm trying out the current incubator in JDK head, and playing
with C ABI calls. It works, but it's really horribly slow, going
via ProgrammableInvoker.invokeMoves and ProgrammableInvoker.invokeNative
rather than generating optimized code to do direct calls.

Is this expected with the current version, or have I hit a bug? I'm
only using scalar types in my function call.

Thanks,

-- 
Andrew Haley  (he/him)
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
https://keybase.io/andrewhaley
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