[clang] [clang-tools-extra] [clang][clang-tools-extra] Remove unused DenseMapInfo::getEmptyKey (PR #201987)

[Fangrui Song via cfe-commits]

MaskRay wrote:

> LGTM. Clang-format fixes should, if you want them fixed, be a separate commit.

Thanks for the review. I'll clang-format the files (e.g. clang/include/clang/AST/BaseSubobject.h) after the getEmptyKey() patch series land.

https://github.com/llvm/llvm-project/pull/201987