[libcxx-commits] [libcxx] [libc++] fix minor performance issue in `basic_string<C>::append()` (PR #210078)

[Louis Dionne via libcxx-commits]

ldionne wrote:

@philnik777  I suspect the results in https://github.com/llvm/llvm-project/pull/210078#issuecomment-5032140617 aren't reliable because we are aggregating results for different sizes under the same benchmark name and taking their median. We need to fix the size-in-name issue first.

https://github.com/llvm/llvm-project/pull/210078