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Author SHA1 Message Date
Nick Lewycky 0b68245ec8 Reimplement isPotentiallyReachable to make nocapture deduction much stronger. 
Adds unit tests for it too.

Split BasicBlockUtils into an analysis-half and a transforms-half, and put the
analysis bits into a new Analysis/CFG.{h,cpp}. Promote isPotentiallyReachable
into llvm::isPotentiallyReachable and move it into Analysis/CFG.

llvm-svn: 187283
 2013-07-27 01:24:00 +00:00