Imported from GitHub PR https://github.com/abseil/abseil-cpp/pull/1632

Prior art for the `vector::erase` optimization:
https://github.com/AmadeusITGroup/amc/blob/efcb7be/include/amc/vectorcommon.hpp#L176-L180 https://github.com/bloomberg/bde/blob/e15f05be6/groups/bsl/bslalg/bslalg_arrayprimitives.h#L3787-L3799 https://github.com/facebook/folly/blob/d24bf04/folly/FBVector.h#L1254-L1262 https://github.com/qt/qtbase/blob/fbfee2d/src/corelib/tools/qarraydataops.h#L856-L861

Merge 6ce011079ccf945ae95434ce45ea6c5e3a088af8 into 55d28d4b

Merging this change closes #1632

COPYBARA_INTEGRATE_REVIEW=https://github.com/abseil/abseil-cpp/pull/1632 from Quuxplusone:trivial-erase 6ce011079ccf945ae95434ce45ea6c5e3a088af8
PiperOrigin-RevId: 612278964
Change-Id: I327ace8a38292b4610c6be031cc334e77c76fd35