[clang] [clang][ExprConstant] Reject integral casts of addr-label-diffs... (PR #171437)

[Eli Friedman via cfe-commits]

https://github.com/efriedma-quic commented:

I don't know of any usage this limit would break, but gcc doesn't impose an equivalent limit, so there could be some code out there doing something weird.

Also, 32 is probably not a good limit for targets with 16-bit pointers, although this sort of construct should be rare on such targets.

https://github.com/llvm/llvm-project/pull/171437