[PATCH] Move the segmented stack switch to a function attribute

[Alex Crichton]

Thank you for taking a look!

> Looks good, but this will require changes to clang to support -fsplit-stack.
> Could you send a companion patch to update clang?

I can indeed, a patch is attached.

> Are there any other major frontends using split stacks that we should
> notify?

I can deal with Rust, and nothing else comes to mind, but I'm probably
also not the right candidate for knowing this information...
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