Bug 1379955 - Use longest prefix match when rewriting lcov entries. r=chmanchester

--HG--
extra : rebase_source : 614fb7c1edd4b5e3a86e8e3edad53ed315f6f9df

python/mozbuild/mozbuild/codecoverage/lcov_rewriter.py

@@ -507,6 +507,7 @@ class UrlFinder(object):
                 src_prefix = ''.join(_prefix(pattern_prefix))
                 self._install_mapping[objdir_path] = (mozpath.join(src_prefix, full_leaf),
                                                       is_pp)
+                break
             offset += 1
 
     def _install_info(self, objdir_path):