This was previously implemented, and it just needed a snapshot to go through

This replaces the link meta attributes with a pkgid attribute and uses a hash
of this as the crate hash. This makes the crate hash computable by things
other than the Rust compiler. It also switches the hash function ot SHA1 since
that is much more likely to be available in shell, Python, etc than SipHash.

Fixes #10188, #8523.

Rename {struct-update,fsu}-moves-and-copies, since win32
failed to run the test since UAC prevents any executable whose
name contaning "update". (#10452)

Some tests related to #9205 are expected to fail on gcc 4.8,
so they are marked as `xfail-win32` instead of `xfail-fast`.

Some tests using `extra::tempfile` fail on win32 due to #10462.
Mark them as `xfail-win32`.

When re-exporting a trait/structure/enum, then we need to propagate the
reachability of the type through the methods that are defined on it.

Closes #9906
Closes #9968

This fixes a bug in which the visibility rules were approximated by
reachability, but forgot to cover the case where a 'pub use' reexports a private
item. This fixes the commit by instead using the results of the privacy pass of
the compiler to create the initial working set of the reachability pass.

This may have the side effect of increasing the size of metadata, but it's
difficult to avoid for correctness purposes sadly.

Closes #9790

Fixes #7276

Some are xfailed, some not, some existing ones get un-xfailed.

If the PointerCast in trans_def_lvalue is removed, these cases cause
LLVM assertion failures.

The tests have consts defined both before and after their uses in order
to prevent bugs that depend on the order in which they are translated.