Find all the usages of `--enable-experimental-feature` or
`--enable-upcoming-feature` in the tests and replace some of the
`REQUIRES: asserts` to use `REQUIRES: swift-feature-Foo` instead, which
should correctly apply to depending on the asserts/noasserts mode of the
toolchain for each feature.
Remove some comments that talked about enabling asserts since they don't
apply anymore (but I might had miss some).
All this was done with an automated script, so some formatting weirdness
might happen, but I hope I fixed most of those.
There might be some tests that were `REQUIRES: asserts` that might run
in `noasserts` toolchains now. This will normally be because their
feature went from experimental to upcoming/base and the tests were not
updated.
If an imported type's conformance cannot be implicitly inferred, allow
it to be explicitly stated via
`__attribute__((__swift_attr__("_BitwiseCopyable")))`.
An imported declaration which has storage that can't be represented in
Swift must not be inferred to be BitwiseCopyable: that inference
involves looking at the (visible) fields.
