[analyzer] Fix results for deleted files

[inishchith]

A file, when deleted in a commit, is incorrectly handled. REF and would lead to

• Duplicate files ( in case the file path is changed )
• Loosing out information related to a file.

The issue persists in CoCom and CoLic backend as the analysis performed in both the cases is at file level

issue triggered in discussion of inishchith/gsoc#6

@valeriocos I've currently worked on a fix for CoCom backend. If you agree, i can open a PR and we can review the changes and then move ahead with working on resolving the same issue for CoLic.

Thanks :)

[valeriocos]

Yes, sure @inishchith , thanks

[valeriocos]

Fixed with 3382cb4