Argyrios Kyrtzidis 5e035651fd [clang/Diagnostic] Use optional to disambiguate between a StoredDiagMessage that is not set vs set as empty string ...

"But when would you have a completely empty diagnostic message", you ask dear reader?
That is when there is an empty "#warning" in code.

rdar://106155415

Differential Revision: https://reviews.llvm.org/D145256

2023-03-03 12:48:48 -08:00

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