[vm/aot] Use TFA to eliminate unused selectors in dispatch table. For each selector, count the number of calls to the selector that are both reachable and polymorphic according to the TFA. Only include selectors in the table with non-zero counts. This reduces the dispatch table size by 30% in dart2js and by 49% in Flutter Gallery (312k memory use reduction on ARM64). Call counts are transferred in a dedicated metadata block with per-selector information. This mechanism also prepares for transferring other per-selector information in the future. Change-Id: Iba15aa4d6c50e67e53c3fd8e542123d3fc98bd07 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/132603 Reviewed-by: Alexander Markov <alexmarkov@google.com>
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