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[BrachProbablityInfo] Set edge probabilities at once. NFC.

Authored by yrouban on Tue, May 12, 10:14 PM.

Description

[BrachProbablityInfo] Set edge probabilities at once. NFC.

Hide the method that allows setting probability for particular
edge and introduce a public method that sets probabilities for
all outgoing edges at once.
Setting individual edge probability is error prone. More over
it is difficult to check that the total probability is 1.0
because there is no easy way to know when the user finished
setting all the probabilities.

Reviewers: yamauchi, ebrevnov
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D79396