Add refs.is_generated to distinguish references from source/generated by ghc #77
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An alternative approach to #73
Instead of dropping all the generated references altogether, we just introduce a boolean flag to refs table that stores True for generated references, and False for references coming from source code.
The overall intention is to fix the hls-rename-plugin bug whereby it incorrectly renames all record fields whenever you rename record constructor, because in HieAST all field selectors have a generated reference to the constructor.