[LLVMdev] New LLVM Pass

[Chris Lattner]

This is just a note to mention that I checked in a new LLVM pass: Loop
Preheader insertion:

http://llvm.cs.uiuc.edu/doxygen/LoopPreheaders_8cpp-source.html

Loop invariant code motion uses it to make sure it has a place to put code
hoisted out of loops.  This dramatically simplifies LICM, because before
it tried to cope without preheaders:

http://llvm.cs.uiuc.edu/doxygen/LICM_8cpp-source.html

-Chris

http://llvm.cs.uiuc.edu/
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