Hal Finkel fc32605ff3 Expose InsertPreheaderForLoop from LoopSimplify to other passes
Other passes, PPC counter-loop formation for example, also need to add loop
preheaders outside of the regular loop simplification pass. This makes
InsertPreheaderForLoop a global function so that it can be used by other
passes.

No functionality change intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182299 91177308-0d34-0410-b5e6-96231b3b80d8
2013-05-20 16:47:07 +00:00
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