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21cd732b60
In DW2, some large TINSEL_EVENT values are read, and they're bigger than
the last TINSEL_EVENT value, but we cast them to `enum TINSEL_EVENT`
values in tinlib.cpp, which is apparently "unspecified behavior up to
C++17 and undefined behavior starting from C++17".
tinlib.cpp:1925:39: runtime error: load of value 9041, which is not
a valid value for type 'Tinsel::TINSEL_EVENT'
tinlib.cpp:1935:31: runtime error: load of value 77, which is not
a valid value for type 'Tinsel::TINSEL_EVENT'
Found with UBSan but the really clear help comes from PVS-Studio
documentation.