Slava Pestov fe41900873 Sema: Split off ConstraintSystem::openUnboundGenericType() from openType() ...

The openType() function did two things:

- Replace unbound generic types like 'G' with fresh type variables
  applied to bound generic types, like 'G<$T0>'.

- Replace generic parameters with type variables from the replacement
  map.

The two behaviors were mutually exclusive and never used from the
same call site, so split them up into two independent functions.

Also, eliminate ConstraintSystem::openBindingType() since it was only
used in one place and could be expressed in terms of existing functions.

2017-05-23 02:10:03 -07:00

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