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Author SHA1 Message Date
Aditya Nandakumar 12d060481a Remove dead instructions before Redoing 
Before reevaluating instructions, iterate over all instructions
to be reevaluated and remove trivially dead instructions and if
any of it's operands become trivially dead, mark it for deletion
until all trivially dead instructions have been removed

llvm-svn: 256773
 2016-01-04 19:48:14 +00:00