prop224: Optimize hs_circ_service_get_intro_circ() digest calculation
Our prop224 function for getting an intro circ given its intro object re-calculates the relay identity fpr all the time:
if (ip->base.is_only_legacy) {
uint8_t digest[DIGEST_LEN];
if (BUG(crypto_pk_get_digest(ip->legacy_key, (char *) digest) < 0)) {
goto end;
}
circ = hs_circuitmap_get_intro_circ_v2_service_side(digest);We could shove that in the hs_service_intro_point_t object as well to cut some digest calculations.
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