Evgeniy Stepanov c8227aa14d [msan] Avoid redundant origin stores. ...

Origin is meaningless for fully initialized values. Avoid
storing origin for function arguments that are known to
be always initialized (i.e. shadow is a compile-time null
constant).

This is not about correctness, but purely an optimization.
Seems to affect compilation time of blacklisted functions
significantly.

llvm-svn: 213239

2014-07-17 09:10:37 +00:00

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