Commits on May 15, 2018

1. Re-apply Relax restriction for folding unconditional branches …

   The commit rL308422 introduces a restriction for folding unconditional
   branches. Specifically if empty block with unconditional branch leads to
   header of the loop then elimination of this basic block is prohibited.
   However it seems this condition is redundantly strict.
   If elimination of this basic block does not introduce more back edges
   then we can eliminate this block.
   
   The patch implements this relax of restriction.
   
   The test profile/Linux/counter_promo_nest.c in compiler-rt project
   is updated to meet this change.
   
   Reviewers: efriedma, mcrosier, pacxx, hsung, davidxl
   Reviewed By: pacxx
   Subscribers: llvm-commits
   Differential Revision: https://reviews.llvm.org/D42691
   
   git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@324572 91177308-0d34-0410-b5e6-96231b3b80d8

   

   Serguei Katkov authored and nikic committed May 15, 2018
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