mlugg 4ec299007a Sema: allow dereferencing ill-defined pointers to zero-bit types at comptime ...

It doesn't matter if a pointer to a zero-bit (i.e. OPV) type is
undefined or runtime-known; we still know the result of the dereference
at comptime. Code may use this, for instance, when allocating zero-bit
types: `@as(*void, undefined)` is entirely reasonable to use at runtime,
since we know the pointer will never be accessed, thus it should be
valid at comptime too.

2023-03-17 01:56:36 -04:00

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