The attribute now has a size parameter and sorts differently:
* Explicitly omit size parameter during construction on 23+
* Tolerate alternate sorting in tests
https://github.com/llvm/llvm-project/pull/171712
Add LLVM range attributes to slice length parameters
It'll take a bunch more work to do this in layout -- because of cycles in `struct Foo<'a>(&'a Foo<'a>);` -- so until we figure out how to do that well, just look for slices specifically and add the proper range for the length.
Extend attribute deduction to determine whether parameters using
indirect pass mode might have their address captured. Similarly to
the deduction of `readonly` attribute this information facilitates
memcpy optimizations.
`&Freeze` parameters are not only `readonly` within the function,
but any captures of the pointer can also only be used for reads.
This can now be encoded using the `captures(address, read_provenance)`
attribute.
Set the dead_on_return attribute (added in LLVM 21) for arguments
that are passed indirectly, but not byval.
This indicates that the value of the argument on return does not
matter, enabling additional dead store elimination.
