C#: CFG and data flow nodes now exist for LHSs.

Author: aschackmull

csharp/ql/test/library-tests/security/dataflow/flowsources/StoredFlowSources.expected

@@ -8,11 +8,13 @@
 | data.cs:28:51:28:71 | access to indexer |
 | data.cs:28:51:28:71 | call to method ToString |
 | data.cs:30:13:30:26 | access to local variable customerReader |
+| entity.cs:31:29:31:33 | access to local variable blogs |
 | entity.cs:31:29:31:82 | DbRawSqlQuery<Blog> blogs = ... |
 | entity.cs:31:37:31:82 | call to method SqlQuery<Blog> |
 | entity.cs:32:30:32:34 | access to local variable blogs |
 | entity.cs:35:31:35:34 | access to local variable blog |
 | entity.cs:35:31:35:39 | access to property Name |
+| entity.cs:38:31:38:39 | access to local variable blogNames |
 | entity.cs:38:31:38:93 | DbRawSqlQuery<String> blogNames = ... |
 | entity.cs:38:43:38:93 | call to method SqlQuery<String> |
 | entity.cs:39:34:39:42 | access to local variable blogNames |