[clang] [clang][dataflow] Fix unsupported types always being equal (PR #129502)

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Discookie wrote:

Ah I see, thanks for letting me know! I'll test a bit more, and add more tests as well if I find something.

One of the things I could see an issue with, is that technically the nullptr literal doesn't have a pointee type, since it's a nullptr_t.
Downstream code should be able to handle a <<<NULL>>> QualType without any further code, but that could be a starting point.

https://github.com/llvm/llvm-project/pull/129502