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

[Florian Mayer via llvm-commits]

fmayer wrote:

> HWASAN is LGTM @eugenis and @pcc for Mem tagging

This doesn't actually change MTE. MemoryTaggingSupport is used by MTE stack tagging and HWASan. For MTE,  I _think_ we need something similar to 

```
      DVI->replaceVariableLocationOp(OldAI, Info.AI);
```

in the Aarch64MemoryTagging pass. But that's for another CL.

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