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Draft: Unpack Unique fields in TyCon

Andrew Martin requested to merge andrewthad/ghc:unpack-tycon-uniques into master

This had been done for CLabel some time ago. I'm not sure why it was not done in TyCon. This should lead to

  • Fewer allocations because of less unneeded thunks
  • Fewer indirections because of unpacking

Let's see what CI has to say.

Edited by Andreas Klebinger

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