[Lex] Avoid repeated hash lookups (NFC) (#107963) MacroAnnotations has three std::optional fields. Functions makeDeprecation, makeRestrictExpansion, and makeFinal construct an instance of MacroAnnotations with one field initialized with a non-default value (that is, some value other than std::nullopt). Functions addMacroDeprecationMsg, addRestrictExpansionMsg, and addFinalLoc either create a new map entry with one field initialized with a non-default value or replaces one field of an existing map entry. We can do all this with a simple statement of the form: AnnotationInfos[II].FieldName = NonDefaultValue; which takes care of default initialization of the fields with std::nullopt when a requested map entry does not exist.
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