*** Submitted as
http://code.google.com/p/go/source/detail?r=d0ca00912d1c ***
bufio: Implement io.ReaderFrom for (*Writer).
This is part 2 of 2 for issue 4028.
benchmark old ns/op new ns/op delta
BenchmarkWriterCopyOptimal 53293 28326 -46.85%
BenchmarkWriterCopyUnoptimal 53757 30537 -43.19%
BenchmarkWriterCopyNoReadFrom 53192 36642 -31.11%
Fixes issue 4028.
R=nigeltao
CC=golang-dev
http://codereview.appspot.com/6565056
Committer: Nigel Tao <[email protected]>
http://codereview.appspot.com/6565056/
