[CaptureTracking] Compute results with and without return capture (#195857)
Currently PointerMayBeCaptured/FindEarliestEscape accept a
ReturnCaptures argument to determine whether returning the pointer
should be considered a capture. If you want to do a capture check for
both cases, you have to invoke the capture tracking API twice.
This PR instead changes the low level APIs to return a pair of capture
components, one where returns are considered non-capturing, and one
where they are considered capturing.
This is for use by https://github.com/llvm/llvm-project/pull/193939,
where AA wants both our usual captures-before (ignoring returns)
reasoning, and captures-anywhere (including returns). This will allow us
to do this in one (cached) query.
llvm-project
d9872ea9 - [CaptureTracking] Compute results with and without return capture (#195857)
