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Improve IR codegen#7259

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bors merged 2 commits intorust-lang:masterrust-lang/rust:masterfrom dotdash:ir_improvementdotdash/rust:ir_improvementCopy head branch name to clipboardJun 21, 2013

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Commits on Jun 20, 2013

• Avoid unnecessary scratch datums for by-copy function arguments

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Commits on Jun 21, 2013

• Avoid pointless allocas for "nil" return values

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