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[WIP] Implement CNF support for non-CAFFY functions

Ömer Sinan Ağacan requested to merge osa1/ghc:compact_non_caffy_funs into master

Just a proof of concept. Commit message below.

This patch allows adding non-CAFFY functions to compact regions. Because non-CAFFY functions don't have any garbage collected references other than stuff in the payload this operation should be safe.

Other changes:

  • Renamed HALF_W_ Cmm macro to TO_HALF_W_. This is more consistent with other TO_ macros.
  • HALF_W_ is now a Cmm type macro for bits16 on 32-bit, bits32 on 64-bit.

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