[clang] Revert "[clang] Don't omit null pointer checks with -fms-kernel (#193… (PR #196307)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman approved this pull request.

LGTM thank you (and sorry for the churn while we figure this out)

https://github.com/llvm/llvm-project/pull/196307