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• Every null check site has a record of whether a null was ever seen.
• Similar points can be made about other low-level checks.
• Every call site with a receiver has a record of which types were encountered (up to 2-3 types).
• There is also a type profile for every checkcast, instanceof, and aastore. (Helps with generics.)
• Every call site and branch point has a record of execution counts.

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