BaseFab: simplify placementNew dispatch#5523
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Replace the constrained placementNew overload set with a single if constexpr implementation. Skip construction for trivially default-constructible element types, where default initialization has no effect, and use the AMReX host/device loop for types with non-trivial default constructors.
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Replace the constrained placementNew overload set with a single if constexpr implementation. Skip construction for trivially default-constructible element types, where default initialization has no effect, and use the AMReX host/device loop for types with non-trivial default constructors.