[libcxx-commits] [libcxx] Revert "[libc++] Introduce ABI sensitive areas to avoid requiring _LIBCPP_HIDE_FROM_ABI everywhere (#131156)" (PR #141756)

[James Y Knight via libcxx-commits]

jyknight wrote:

Given that this is a revert that is restoring the code to the previous state, I will ignore the "Check code formatting" presubmit failure.

https://github.com/llvm/llvm-project/pull/141756