Merge pull request #27 from access-softek/dil-local-vars

Apply all the changes from upstream review comments on other DIL PRs.

Author: cmtice

lldb/docs/dil-expr-lang.ebnf

@@ -75,7 +75,6 @@ primary_expression = numeric_literal
                    | boolean_literal
                    | pointer_literal
                    | id_expression
-                   | "this"
                    | "(" expression ")"
                    | builtin_func ;