swift234

Add a slightly less close than CC_OneArgumentMismatch closeness.

Producing single argument mismatches involving generics causes some
gross looking error messages if the generic mismatches get put into the
same closeness bucket as non-generic mismatches.

E.g. `var v71 = true + 1.0` used to produce `error: cannot convert
value of type 'Bool' to expected argument type 'Double’`, but would now
end up with `binary operator '+' cannot be applied to operands of type
'Bool' and 'Double’` `overloads for '+' exist with these partially
matching parameter lists: (Double, Double), (T, T.Stride), (T.Stride,
T)`.

Resolve this by adding CC_OneGenericArgumentNearMismatch and
CC_OneGenericArgumentMismatch, that are similar but ever so slightly
not as close as a mismatch involving non-generic functions. This gets
back the original error message in cases like the above, because there
is only one declaration of `+` which partially matches and is
non-generic, and the generic partial matches are now farther away.

But now single arg mismatches and nearness work for single-archetype
generic functions, as in the additions to the SR-69 test at the end of
deduction.swift.