Imported from GitHub PR https://github.com/abseil/abseil-cpp/pull/1618

I noticed while working on #1615 that `inlined_vector` could use the trivial relocatability trait here, too.
Here the memcpy codepath already exists; we just have to opt in to using it.
Merge 567a1dd9b6b3352f649e900b24834b59e39cfa14 into a7012a5b

Merging this change closes #1618

COPYBARA_INTEGRATE_REVIEW=https://github.com/abseil/abseil-cpp/pull/1618 from Quuxplusone:trivial-swap 567a1dd9b6b3352f649e900b24834b59e39cfa14
PiperOrigin-RevId: 609019296
Change-Id: I4055ab790245752179e405b490fcd479e7389726