Commits on Nov 11, 2015

1. Separate tree_builder/rules.rs code generation from unstable optimiza… …

   …tions
   
   … in Cargo features.
   
   The 'codegen' feature is only useful when working on that file,
   dependency don’t need it.
   But they might still want NonZero/unsafe_no_drop_flag optimizations
   when on Rust Nightly.
   
   This will reduce breaking of dependent crates when libsyntax changes.

   

   SimonSapin committed Nov 11, 2015

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