[analyzer] Make CmpRuns external-user friendly.

CmpRuns can be used for static analyzer bug report comparison. However,
we want to make sure external users do not rely on the way bugs are
represented (plist files). Make sure that we have a user
friendly/documented API for CmpRuns script.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@160314 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed