[libc++] Investigate vector code size regression after introduction of size-based vector
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libc++
performance
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- LLVM
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Description
See https://github.com/llvm/llvm-project/pull/218658 and https://github.com/llvm/llvm-project/pull/216822.
The regression with `emplace_back` seems to be mostly addressed by #218658, but we are still seeing a regression in `__relocate`.
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