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Add an optional list of blocks to avoid when looking for a path in…

Authored by nicholas on Apr 1 2019, 6:05 PM.

Description

Add an optional list of blocks to avoid when looking for a path in isPotentiallyReachable.

The leads to some ambiguous overloads, so update three callers.

Differential Revision: https://reviews.llvm.org/D60085

llvm-svn: 357447