[4.2] Cherry pick: skip allocation if reserve capacity is smol #16807
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Add StringBuilderSmallReservingCapacity variant to measure the excess overhead caused by calls to reserve capacity. If a string is small, and the capacity is small, this will demonstrate overhead if an allocation happens.
If the requested capacity is small enough to fit in our small string representation, don't allocate a UTF-16 buffer, instead just return early.
milseman
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@swift-ci please test |
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@swift-ci please test |
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4.2 cherry-pick of #16694
rdar://problem/39501083