[demangler] Add StringView conversion operator
The OutputBuffer class tries to present a NUL-terminated string API to
consumers. But several of them would prefer a StringView. In
particular the Microsoft demangler, juggles between NUL-terminated and
StringView, which is confusing.
This adds a StringView conversion, and adjusts the Demanglers that can
benefit from that.
Reviewed By: dblaikie
Differential Revision: https://reviews.llvm.org/D120990
1 file changed