Add difference reproduction tooling #2
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Instead of comparing with unmutated versions of just O0 and O3, this commit automatically compares with all given opt levels. In addition, file names for each seed directory are more intuitive, and most human-unreadable files are made to be removed when not in debug mode.
This commit generates fn_info.json for each kept program seed directory. Now kept seeds also retain the chosen function's return type and argument types so that future repro scripts don't have to reparse the C or IR files. Minor edits were also made to improve code clarity and artifact naming.
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This commit adds scripts and changed sem.py behaviors to better suit difference verification.