[libc++] Investigate removing fstream::__read_mode() from the ABI
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libc++
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- LLVM
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Description
From https://github.com/llvm/llvm-project/pull/210951/changes#r3630946478, we should investigate whether `fstream::__read_mode()` ever leaks into user ABIs. This might not be the case since it's only ever called from `underflow()`.
The symbol is `_ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE11__read_modeEv`
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