Refactors the behaviour of building graphs out of FileAnalysis, allowing for analysis of the GraphResult by the callee without having to rebuild the graph. Means when we want to analyse the constructed graph (planned for later revisions), we don't do repeated work.
Also makes CFI verification in FileAnalysis now return an enum that allows us to differentiate why something failed, not just that it did/didn't fail.
Reviewers: vlad.tsyrklevich
Subscribers: kcc, pcc, llvm-commits
Differential Revision: https://reviews.llvm.org/D39764
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317927 91177308-0d34-0410-b5e6-96231b3b80d8