[PATCH] D140250: Define NULL in its own header

[Ian Anderson via Phabricator via llvm-commits]

iana added a comment.

In D140250#4076851 <https://reviews.llvm.org/D140250#4076851>, @aaron.ballman wrote:

> I'd expect there to be a test under `clang/test/Headers/` showing that this new header works as expected.

It's covered pretty well by stddefneeds.cpp already. I can add a new one if you want, but it'd pretty much be a copy/paste


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  https://reviews.llvm.org/D140250/new/

https://reviews.llvm.org/D140250