Rafael Espindola 78f79310a7 Revert 209903 and 210040.
The messages were

 "PR19753: Optimize comparisons with "ashr exact" of a constanst."
 "Added support to optimize comparisons with "lshr exact" of a constant."

They were not correctly handling signed/unsigned operation differences,
causing pr19958.

llvm-svn: 210393
2014-06-07 04:12:35 +00:00
..
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