Igor Laevsky ee40d1e8da Re-submit r272891 "Prevent dangling pointer problems in BranchProbabilityInfo" ...

Most possibly problem was caused by the same reason as PR28400. This change
bypasses it by using CallbackVH instead of AssertingVH.

Differential Revision: https://reviews.llvm.org/D20957

llvm-svn: 275563

2016-07-15 14:31:16 +00:00

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