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Most statements will be assignment statements, represented by
MODIFY_EXPR. A CALL_EXPR whose value is ignored can
also be a statement. No other C expressions can appear at statement level;
a reference to a volatile object is converted into a MODIFY_EXPR.
In GIMPLE form, type of MODIFY_EXPR is not meaningful. Instead, use type
of LHS or RHS.
There are also several varieties of complex statements.