[LLVMdev] Pass API change

[Chris Lattner]

For those working from LLVM CVS:

I simplified the pass interface, eliminating the need for the RegisterOpt 
vs RegistierAnalysis distinction.  If you're working on an out-of-tree 
pass, you should just use 'RegisterPass' instead of RegisterOpt or 
RegisterAnalysis.  I've updated the "Writing an LLVM Pass" doc to reflect 
current best practice.

-Chris

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