[LLVMdev] Does the pass -postdomfrontier exist?

[shadowkernel]

Hi,

I found the -postdomfrontier pass in *llvm*.org/docs/Passes.html, but 
'opt' does not accept it. I could not find the relevant codes in 
PostDominance.cpp in SVN trunk, but I found some relevant codes  here 
http://opensource.apple.com/source/clang/clang-137/src/lib/Analysis/PostDominators.cpp. 


I am wondering why this pass is removed and what should I do if I want 
the post dominance frontier information?

Thanks!