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Tolerate pathological growth of optCSEHash (#40056)
The optCSEhash can grow an unbounded amount if the function has numerous trees which are put into the optCSEhash as possible CSE candidates, but fewer than MAX_CSE_CNT are found, then the compiler will spend excessive amounts of time looking up entries in the optCSEhash. This fix addresses the issue by making the optCSEhash able to grow its count of buckets.
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