Add libmachine to share Triple between librustc & compiletest.#13605

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DiamondLovesYou wants to merge 5 commits intorust-lang:masterfrom

DiamondLovesYou:libmachine

Commits on Apr 18, 2014

Introducing libmachine: a small crate shared between librustc, libsyntax,
Richard Diamond
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Use libmachine in librustc. Also removed Os in metadata/loader.rs.
Richard Diamond
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Move FileSearch::dylibname to Os::dylibname. De-duplicate Triple::dylibname,
Richard Diamond
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Use libmachine in libsyntax. I choose to use ```pub use```s to ease
Richard Diamond
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Use libmachine in compiletest.
Richard Diamond
committed