Alex Lam S.L f5cbe19b75 invert reduce_vars tracking flag (#1519) ...

Modules like webpack and grunt-contrib-uglify still uses `ast.transform(compressor)` before `Compressor.compress(ast)` was introduced.

Workaround this compatibility issue by deactivating `reduce_vars` in such case.

Also fix use case with omitted `options` when calling `Compressor()`.

fixes #1516

2017-03-01 04:12:10 +08:00

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