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In D148959, I removed usage of std::string_view::substr because it may throw, and libcxxabi cannot use such code. I missed one instance in llvm::starts_with. That is blocking copying the code back upstream in D148566. Mark these helpers noexcept (as they are in C++20) as well, to remind future travelers. Make these changes upstream, and copy them back downstream using libcxxabi/src/demangle/cp-to-llvm.sh. Reviewed By: #libc_abi, MaskRay, ldionne Differential Revision: https://reviews.llvm.org/D151260