[libcxx-commits] [libcxx] Revert "[libc++] Avoid constructing additional objects when using map::at" (PR #160738)

[Prabhu Rajasekaran via libcxx-commits]

Prabhuk wrote:

FWIW our toolchain builders at google are blocked as well and this revert will help us get unblocked. +1 on revert to land unconditionally. 

https://github.com/llvm/llvm-project/pull/160738