C++: Minor tweaks to ExprInVoidContext#2189
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It's not used anywhere outside `VoidContext.qll`, where it was defined. The use in `VoidContext.qll` is 10 years old and was a workaround for an extractor bug that no longer exists.
It turns out this was used in the internal repo.
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These tweaks to
ExprInVoidContextfell out of my work on #1999. See also https://github.slack.com/archives/CP75PA8Q1/p1571817660005700.I've tested on four large snapshots that removing the
Qualifiercase fromexprInVoidContextmakes no difference.