[analyzer] Fix IssueHash generation.

Differential Revision: http://reviews.llvm.org/D14919 

Original patch by: Gyorgy Orban!

llvm-svn: 254394

clang/lib/Basic/SourceManager.cpp

@@ -1717,7 +1717,7 @@ SourceLocation SourceManager::translateLineCol(FileID FID,
                                                unsigned Col) const {
   // Lines are used as a one-based index into a zero-based array. This assert
   // checks for possible buffer underruns.
-  assert(Line != 0 && "Passed a zero-based line");
+  assert(Line && Col && "Line and column should start from 1!");
 
   if (FID.isInvalid())
     return SourceLocation();