commit 75cdc1d5cce42ccee396dbe393c6a6cca21fc0de
author Nick Desaulniers <ndesaulniers@google.com> Wed May 31 09:50:35 2023 -0700
committer Copybara-Service <copybara-worker@google.com> Wed May 31 11:08:19 2023 -0700
tree 3b6a83c45fc0c9dcccf3aaf28be9c59d49586ad3
parent 895624e04c75a146dab1ce05bbedd3ce92e98708

[libcxxabi] copy back std::string_view patches from LLVM

I made a series of changes to LLVM's demangle in:
- D148348
- D148353
- D148363
- D148375
and so did Fangrui in 3ece37b3fa2c and Ashay in D149061.

I didn't notice the banner about there being two copies of this in tree
and was modifying the downstream versions. Copy these changes back to
the upstream version. Oops!

Reviewed By: MaskRay, #libc_abi, ldionne, phosek

Differential Revision: https://reviews.llvm.org/D148566

GitOrigin-RevId: 728a45181d7e83bcedc705a5b7f161056c693c83