[UnJ] Common some code. NFC

Create a processHeaderPhiOperands for analysing the instructions
in the aft blocks that must be moved before the loop.

Differential Revision: https://reviews.llvm.org/D49061



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@338033 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed