[CFLAA] Split out more things from CFLSteens. NFC.

"More things" = StratifiedAttrs and various bits like interprocedural
summaries.

Patch by Jia Chen.

Differential Revision: http://reviews.llvm.org/D21964


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@274592 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed