[MERGE] tuned_gzip.bytes_to_gzip

[Robert Collins]

This is another tweak-level optimisation. This time no tests break; I've
not written specific tests for the helper, but I am willing to be told
to go back and do that (they would consist of 'make a gzip by hand, use
the helper, compare'). I didn't write specific tests because we don't
have tests for tuned_gzip - we exercise the gzip layer heavily in our
knit tests, and we do test creating gzips via the regular api and
reading them via the normal knit code - if the new helper is broken,
test_knit breaks.

-Rob
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