[6.0 – stdlib] add failure explanations to debug preconditions #73943
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Add explanations when the _isPOD() precondition is not met in loadUnaligned() and storeBytes().
Addresses rdar://128543858
Original PR: #73900.
Risk: Low. This will not affect release-mode code, and adds some explanatory output to an existing trap in debug mode.
Reviewer: @Azoy