[llvm] [hwasan] Update dbg.assign intrinsics in HWAsan pass (PR #78606)

[Orlando Cazalet-Hyams via llvm-commits]

OCHyams wrote:

Reapplied in [7616071](https://github.com/llvm/llvm-project/commit/76160718df7c1f31ff50a4964d749c2b9d83f9cf), softening the assertion `assert(DAI->getAddress() == AI);` to an if-check, because the DbgAssignIntrinsic might be using the Alloca in the value-component only (in which case DAI->getAddress() != AI).

https://github.com/llvm/llvm-project/pull/78606