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This pass forward branches through conditions when it can show that the conditions is either always true or false for a predecessor. This currently only handles the most simple cases of this, but is successful at threading across 2489 branches and 65 switch instructions in 176.gcc, which isn't bad. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21306 91177308-0d34-0410-b5e6-96231b3b80d8