[llvm] [HWASAN] Update dbg.assign intrinsics in HWAsan pass (PR #79864)

[Orlando Cazalet-Hyams via llvm-commits]

OCHyams wrote:

I've rebased, squashing initial commits (and fixing author email typo), then addressed review comments. Thanks for the reviews!

https://github.com/llvm/llvm-project/pull/79864