RFC: rename -fbranch-probabilities

[Nathan Sidwell]

Andrew Pinski wrote:
> Now that -fbranch-probabilities is used for more than just branch
> probabilities (reorder blocks is an example), I propose to rename
> the option -fbranch-probabilities to -fuse-profile-data.
doesn't seem necessary. block order is using branch probabilities
to determine the best order.

nathan
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          The voices in my head said this was stupid too
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