Port to x64 at least, not just x86.

[graydon]

Hopefully we can get to a point where we only need a ucontext impl to port to a new platform. Still not quite at this stage yet.

[brson]

Can this be delayed until after the 0.1 milestone?

[graydon]

yes. it's not critical, especially if we're shipping the llvm libs ourselves. it's just something that will be embarrassing.

[pcwalton]

Per a conversation with Graydon I'm marking this as blocking 0.1.

[nikomatsakis]

This is getting very close. At this point the next step is to generate the rustc compiler itself and start testing it.

[nikomatsakis]

Fixed in @50e2e07255fd3469b0c6d8a2725983bccf0c67b2