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Author SHA1 Message Date
Arnaud A. de Grandmaison 87c473f0d1 IndVarSimplify: do not recompute an IV value outside of the loop if : 
- it is trivially known to be used inside the loop in a way that can not be optimized away
- there is no use outside of the loop which can take advantage of the computation hoisting

llvm-svn: 177432
 2013-03-19 20:00:22 +00:00