C++: Import 'GVN' in 'Overflow.qll' to prevent IR reevaluation. #6347
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When we merged #6340 we re-introduced a caching issue that caused the IR to be re-evaluated. This PR fixes that re-evaluation bug.
I'm leaving this as a draft while I'm verifying that this indeed fixes the problem: https://jenkins.internal.semmle.com/job/Changes/job/CPP-Differences/2167/https://jenkins.internal.semmle.com/job/Changes/job/CPP-Differences/2167/ shows that this PR fixes the problem: