[CFLAA] Refactor to remove redundant maps. NFC.

Patch by Jia Chen.

Differential Revision: http://reviews.llvm.org/D21233


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@272578 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed