[profdata] Use --hot-func-list to show all hot functions (#149428) The `--hot-func-list` flag is used for sample profiles to dump the list of hot functions. Add support to dump hot functions for IRPGO profiles as well. This also removes a `priority_queue` used for `--topn`. We can instead store all functions and sort at the end before dumping. Since we are storing `StringRef`s, I believe this won't consume too much memory.
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