Nikolas Klauser 4562efc674
Reapply "[libc++] Simplify the implementation of reserve() and shrink_to_fit() (#113453)" (#125888)
The capacity is now passed correctly and a test for this path is added.

Since we changed the implementation of `reserve(size_type)` to only ever
extend,
it doesn't make a ton of sense anymore to have `__shrink_or_extend`,
since the code
paths of `reserve` and `shrink_to_fit` are now almost completely
separate.

This patch splits up `__shrink_or_extend` so that the individual parts
are in `reserve`
and `shrink_to_fit` depending on where they are needed.

This reverts commit 59f57be94f38758616b1339b293b43af845571af.
2025-02-06 09:35:24 +01:00
..