[clang-tools-extra] [clang-tidy] Fix `modernize-use-nullptr` crash on 32-bit Windows (PR #160023)

[Jonathan Hyry via cfe-commits]

eljonny wrote:

Does this fix the same issue with `hicpp-use-nullptr`?
It looks like the code for that check might be separate.
I believe that check is also affected by the same crash.

https://github.com/llvm/llvm-project/pull/160023