It is no longer necessary to produce `.swiftinterface` files the support older
compilers that lack support for the NoncopyableGenerics feature. Cleaning this
up makes the stdlib `.swiftinterface` far more readable.
Some compilers have the NoncopyableGenerics feature enabled via
interesting mechanisms but do not have ConformanceSuppression. To
support such compilers, the NoncopyableGenerics feature must appear
before ConformanceSuppression in the list of features. Otherwise, when
parsing the portion of the swiftinterface corresponding to an entity
which involves both features, the first check will be for
NoncopyableGenerics (which that old compiler has) and the code inside
will involve ConformanceSuppression (which that old compiler does not
have).
rdar://128611158
