* First try at implementing TD pass this does not merge global nodes yet,
    among other things.
  * Significant rewrite of TD pass to avoid potentially N^2 algorithms if
    possible.  It is still not complete, but at least it's checked in now.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4215 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed