[llvm] [hwasan] Omit tag check for null pointers (PR #122206)

[Vitaly Buka via llvm-commits]

vitalybuka wrote:

> There are no instances of HWASan tag checks for provably-null pointers in clang (when bootstrapping revision [b48b99f](https://github.com/llvm/llvm-project/commit/b48b99f6253c917a15b698a68c1bf41d15ea6dc6)).

That's what I though.
The patch is LGTM, as it's relatively simple. But maybe we don't need it.



https://github.com/llvm/llvm-project/pull/122206