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Author SHA1 Message Date
Chandler Carruth c908ca1766 Port the global copy optimization from the SROA pass to InstCombine. 
This optimization is really just replacing allocas wholesale with
globals, there is no scalarization.

The underlying motivation for this patch is to simplify the SROA pass
and focus it on splitting and promoting allocas.

llvm-svn: 162271
 2012-08-21 08:39:44 +00:00