[PATCH] D21165: Disable MSan-hostile loop unswitching.

[Evgeniy Stepanov via llvm-commits]

eugenis added a comment.

Of course, the loop may have other side-effect instructions that do not depend on a.
So we need to suppress reporting of "if undef" not just when the "then" BB has no side effects, but when "then" and "else" BBs have exactly the same set of side effects.


Repository:
  rL LLVM

http://reviews.llvm.org/D21165