Reid Kleckner 1ef49218b3 Don't emit lifetime markers when msan is enabled ...

In r235553, Clang started emitting lifetime markers more often. This
caused false negative in MSan, because MSan only poisons all allocas
once at function entry. Eventually, MSan should poison allocas at
lifetime start and probably also lifetime end, but until then, let's not
emit markers that aren't going to be useful.

llvm-svn: 235613

2015-04-23 18:07:13 +00:00

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