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UBSan flags two spots that shift a value into the top bits of a word via a
signed operand:
* lib/mdfour.c copy64(): `in[i] << 24` promotes the uchar to int, so a
byte >= 128 overflows int (UB). Cast each byte to uint32.
* hashtable.c NON_ZERO_64(): `(int64)(x) << 32` overflows int64 whenever
x's high bit is set. Shift as uint64_t (covers all four call sites).
Behavior-preserving -- only the intermediate type changes; the resulting
bit pattern is identical.