[PATCH] Preserving 'nonnull' metadata in SimplifyCFG

[Philip Reames]

Hi hfinkel,

The actual change in this review are trivial (1 line), but I'd like a second opinion on their legality from someone familiar with the context.  I *believe* that this is legal, but a confirmation would help.  The semantics we're going for are: 'nonnull' is preserved when two instructions are merged iff both have it.  

Also, anyone know a reason we're not merging metadata when sinking instructions but are merging when hoisting?

http://reviews.llvm.org/D5910

Files:
  lib/Transforms/Utils/SimplifyCFG.cpp
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