[PATCH] D138539: Use std::nullopt_t instead of NoneType (NFC)

[David Spickett via Phabricator via cfe-commits]

DavidSpickett added a reviewer: DavidSpickett.
DavidSpickett added a comment.

lldb parts LGTM.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D138539/new/

https://reviews.llvm.org/D138539