swift234

Make TypeSubstCloner take a substitution list directly.

Rather than calling getSubstitutions() in various places on the apply
that we are cloning the body of, pass the substitution list in
directly when creating the cloner.

This is not interesting for the generic specializer, but is important in
mandatory inlining when we go to inline an apply of a partial apply,
where we need to use the full list of substitutions for both.

Swift SVN r18951