[CFLAA] Split the CFL graph out from CFLSteens. NFC.

Patch by Jia Chen.

Differential Revision: http://reviews.llvm.org/D21963


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@274591 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed