Users not able to know which file causes issue when exception loading pdb

[shaopeng-gh]

When user scans a folder in the pipeline, if there is exception loading a pdb file (e.g. malformed), currently users are not able to know which file is causing the problem. And the scan target could have a lot of files.
This issue is created to see what improvements we can do about it.

##[error]Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. 
##[error] at Dia2Lib.IDiaDataSource.loadDataForExe(System.String, System.String, System.Object) 
##[error] at Microsoft.CodeAnalysis.BinaryParsers.ProgramDatabase.Pdb.WindowsNativeLoadPdbFromPEUsingDia(System.String, System.String, System.String) 

[JustinSchneiderPBI]

We're seeing this too. :(