compat_asn1: cache ASN.1 parsing
Implement caches for _parse_asn1_commit() and _parse_asn1_files(). Avoids re-running git and reading the files if the same item is parsed. Speeds up the compat checking in asn_process by ~25%.
Implement caches for _parse_asn1_commit() and _parse_asn1_files(). Avoids re-running git and reading the files if the same item is parsed. Speeds up the compat checking in asn_process by ~25%.