Move trans, back, driver, and back into a new crate, rustc_trans.#19002

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nikomatsakis wants to merge 1 commit intorust-lang:masterfrom nikomatsakis:crates

+640-532

Commits on Nov 18, 2014

Move trans, back, driver, and back into a new crate, rustc_trans. Reduces memory usage significantly and opens opportunities for more parallel compilation.
nikomatsakis
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