Implement SimplifyCFG/branch-phi-thread.ll, the most trivial case of threading
control across branches with determined outcomes.  More generality to follow.
This triggers a couple thousand times in specint.

llvm-svn: 23391
1 file changed
tree: d3ba70e9dc8e0ad7dec6e4066c619087e8bd5fce
  1. llvm/