Saleem Abdulrasool 0174528f81 stdlib: fix the problem swept under the rug in 58a97f1603 ...

The `-Winvalid-offsetof` warning is valid in this case. `offsetof` is
being applied to types with a non-standard layout. The layout of this
type is undefined by the specification. There is no guarantee that the
type layout is uniform across all ABIs. It is not possible to portably
compute the offset statically, especially efficiently.

Sink this check into a unit test to avoid performing this test at
runtime. In order to do this in the standard library, we would need to
do this check through a global constructor.

2025-02-03 09:25:06 -08:00

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