This builds upon previous work, which created a section for async entry
funclets and a section for async exit funclets, to also create a section
for all other funclets, allowing tools to identify any async funclet.
Depends on:
* https://github.com/swiftlang/llvm-project/pull/12303
rdar://146656133
Adds sections `__TEXT,__swift_as_entry`, and `__TEXT,__swift_as_ret` that
contain relative pointers to async functlets modelling async function entries,
and function returns, respectively.
Emission of the sections can be trigger with the frontend option
`-Xfrontend -enable-async-frame-push-pop-metadata`.
This is done by:
* IRGen adding a `async_entry` function attribute to async functions.
* LLVM's coroutine splitting identifying continuation funclets that
model the return from an async function call by adding the function
attribute `async_ret`. (see #llvm-project/pull/9204)
* An LLVM pass that keys off these two function attribute and emits the
metadata into the above mention sections.
rdar://134460666
Felipe de Azevedo Piovezan
Ben Barham
Arnold Schwaighofer