Auto merge of #7838 - nhamovitz:trailing_zs_arr_wo_repr, r=Manishearth

Warn on structs with a trailing zero-sized array but no `repr` attribute

Closes #2868

changelog: Implement ``[`trailing_empty_array`]``, which warns if a struct is defined where the last field is a zero-sized array but there are no `repr` attributes. Zero-sized arrays aren't very useful in Rust itself, so such a struct is likely being created to pass to C code or in some other situation where control over memory layout matters. Either way, a `repr` attribute is needed.

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