[llvm] [MemoryLocation] Model value parameter of memset.pattern intrinsic (PR #138559)

[Philip Reames via llvm-commits]

preames wrote:

Notes:
1) There are more changes needed here - in particular CaptureTracking, and possibly BasicAA.
2) Relating to (1), I couldn't find an obvious spot to just set the capture attributes and readnone on the parameter of the intrinsic signature if-and-only-if it were a pointer.  Is there something I'm missing?

https://github.com/llvm/llvm-project/pull/138559