libstd miri tests: avoid warnings
Ignore tests in a way that all the code still gets compiled, to get rid of all the "unused" warnings that otherwise show up when running the test suite in Miri.
This reverts commit 604f049cd5.
This is purely a revert of cuviper's revert "Restore `T: Sized` on
`ptr::is_null`". So double revert means this is code written by cuviper!
The exact semantics of `is_null` on unsized pointers are still debatable,
especially for trait objects. It may be legal to call `*mut self`
methods on a trait object someday, as with Go interfaces, so `is_null`
might need to validate the vtable pointer too.
For `as_ref` and `as_mut`, we're assuming that you cannot have a non-null
data pointer with a null vtable, so casting the unsized check is fine.
`NonZero::is_zero()` was already casting all pointers to thin `*mut u8`
to check for null. It seems reasonable to apply that for `is_null()` in
general, and then unsized fat pointers can also be used with `as_ref()`
and `as_mut()` to get fat references.
