CPP: Fix some use after free FPs. #14275
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We try and exclude source expressions that are frees themselves however if there are more than one expresssion for a node we may use one expression to detect it is a use but not eliminate it due to the other expression.
The dataflow node for
a = bhas two expressions (a = bandb).a = bis a function argument to an unknown function so we assume that it is used.bis not an argument tofree. By using different expression we incorrectly work out that the node is a non-free use.