Fixup allocation headers with OpenMPTarget backend

[dalg24]

Bug caught by one of ArborX unit tests that checks allocation prefixes.

The functionality is provided through inheritance by

kokkos/core/src/impl/Kokkos_SharedAlloc_timpl.hpp

Lines 98 to 112 in 4d0e393

	template <class MemorySpace>
	void* SharedAllocationRecordCommon<MemorySpace>::reallocate_tracked(
	void* arg_alloc_ptr, size_t arg_alloc_size) {
	derived_t* const r_old = derived_t::get_record(arg_alloc_ptr);
	derived_t* const r_new =
	allocate(r_old->m_space, r_old->get_label(), arg_alloc_size);
	Kokkos::Impl::DeepCopy<MemorySpace, MemorySpace>(
	r_new->data(), r_old->data(), std::min(r_old->size(), r_new->size()));
	record_base_t::increment(r_new);
	record_base_t::decrement(r_old);
	return r_new->data();
	}

[masterleinad]

Looks good to me.

[rgayatri23]

LGTM