Add .write_str() to std::rt::io, and port to rt::io for libstd Repr and ToStr#8089

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bluss wants to merge 8 commits intorust-lang:masterfrom

bluss:rt-io-repr

Commits on Aug 2, 2013

std: Add Writer trait StringWriter to rt::io
blake2-ppc
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std: Use rt::io for memory IO in std::to_bytes
blake2-ppc
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std: Replace fn borrow with .as_slice() in std::to_bytes
blake2-ppc
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std: Add a ToStr benchmark for a HashMap
blake2-ppc
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std: Use rt::io in ToStr
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std: Use to_str_writer for int and uint
blake2-ppc
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std: Use rt::io and StringWriter for in-memory I/O in std::repr
blake2-ppc
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std: Add fixme note for ToStr regarding issue #7771
blake2-ppc
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