/// ConstantFoldConstantExpression - Attempt to fold the constant expression
/// using the specified TargetData. If successful, the constant result is
/// result is returned, if not, null is returned.
-Constant *ConstantFoldConstantExpression(ConstantExpr *CE,
+Constant *ConstantFoldConstantExpression(const ConstantExpr *CE,
const TargetData *TD = 0);
/// ConstantFoldInstOperands - Attempt to constant fold an instruction with the