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GAtomicArray: Ensure metadata does not misalign the payload

Alexander Richardson requested to merge arichardson/glib:g-atomic-array-alignment into main

We have to ensure that the memory location is sufficiently aligned to store any object. This unbreaks the code for CHERI where using gsize results in values that are only aligned to 8 bytes, but we need 16 byte alignment for pointers. This is fully API/ABI compatible since amount of padding before the actual allocation does not change for existing architectures, only for CHERI.

Helps: #2842

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