Spec on casting to integer with smaller range than value

[Dennis]

On Saturday, 28 March 2020 at 15:33:35 UTC, kinke wrote:
> that should probably be explicitly mentioned as undefined 
> behavior, to account for the observed LLVM/gcc behavior.

Which would make `cast(int) someFloat` not allowed in @safe code.
Is there any chance LLVM could be instructed to treat it as 
implementation-defined behavior?