[PATCH] Allow 0-weight branches in BranchProbabilityInfo.

[Diego Novillo]

On Wed, May 6, 2015 at 11:27 AM, Duncan P. N. Exon Smith
<dexonsmith at apple.com> wrote:

> (Or we otherwise need to check that we have space to add 1 to all the
> weights of 0.)

I've gone this way in the update to the BPI scaling patch
(http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20150504/275088.html).

Thanks. Diego.