[LLVM/ABI] Don't pass null pointer to byVal attribute #44555
                
     Merged
            
            
          
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In #43417 I adjusted the ABI code to pass the LLVM type to the
ByValattribute.IIRC the LLVM type should come from the outside (and does for every other case),
but I seem to have left some old cold in that tried to get the LLVM type for the
argument again, but could return Null for VecElement.
In #44365 @pchintalapudi noticed that the LLVM verifier would fail, since in the
ccalltests we try to pass a VecElement wrongly.