[IR] Add ImplicitTrunc argument to ConstantInt::get() (#170865)
Add an ImplicitTrunc argument to ConstantInt::get(), which allows
controlling whether implicit truncation of the value is permitted.
This argument currently defaults to true, but will be switched to false
in the future to guard against signed/unsigned confusion, similar to
what has already happened for APInt.
The argument gives an opt-out for cases where the truncation is
intended. The patch contains one illustrative example where this
happens.
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