Descriptionruntime: use explicit MSpan "needzero" bit instead of using block content
Cleans up the code and removes the possibility of madvise problems.
Patch Set 1 #Patch Set 2 : diff -r 664c8763de42 https://code.google.com/p/go/ #Patch Set 3 : diff -r 664c8763de42 https://code.google.com/p/go/ #
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