blockchain: skip checking tx semantics in embedded block hash range

If the txes are bad, this'll be picked up by the block hash mismatch
since the tx merkle root is part of the block hash.

src/cryptonote_core/cryptonote_core.cpp

@@ -564,7 +564,11 @@ namespace cryptonote
         rv.outPk[n].dest = rct::pk2rct(boost::get<txout_to_key>(tx.vout[n].target).key);
     }
 
-    if(!check_tx_semantic(tx, keeped_by_block))
+    if (keeped_by_block && get_blockchain_storage().is_within_compiled_block_hash_area())
+    {
+      MTRACE("Skipping semantics check for tx kept by block in embedded hash area");
+    }
+    else if(!check_tx_semantic(tx, keeped_by_block))
     {
       LOG_PRINT_L1("WRONG TRANSACTION BLOB, Failed to check tx " << tx_hash << " semantic, rejected");
       tvc.m_verifivation_failed = true;