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The current code will simplify away some casts at evaluation time
but doesn't take in account some special cases:
* (bool)~<int> is not equivalent to ~(bool)<int> (anything not all 0 or 1)
* (float)~<int> is not equivalent to ~(float)<int> which doesn't make sense.
* (int)(float)<int> is not a no-op if the (float) overflows
This kind of simplification is better done on the IR where the different
kind of casts correspond to distinct instructions.
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
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