Move the workspace configuration to a virtual manifest. This
reorganization makes a more clear separation between package contents
and support files that don't get distributed. It will also make it
easier to merge this repository with `compiler-builtins` which is
planned (builtins had a similar update done in [1]).
LICENSE.txt and README.md are symlinkedinto the new directory to ensure
they get included in the package.
[1]: https://github.com/rust-lang/compiler-builtins/pull/702
In preparation for switching to a virtual manifest, move the `libm`
crate into a subdirectory and update paths to match.
Updating `Cargo.toml` is done in the next commit so git tracks the moved
file correctly.
This crate has a handful of lists that need to list all API and can't
easily be verified. Additionally, some longer lists should be kept
sorted so they are easier to look through. Resolve both of these by
adding a check in `update-api-list.py` that looks for annotations and
verifies the contents are as expected.
Annotations are `verify-apilist-start`, `verify-apilist-end`,
`verify-sorted-start`, and `verify-sorted-end`.
This includes fixes for anything that did not meet the criteria.
Update the script to produce, in addition to the simple text list, a
JSON file listing routine names, the types they work with, and the
source files that contain a function with the routine name. This gets
consumed by another script and will be used to determine which extensive
CI jobs to run.
