Add early return in ComputeTxEnv for state sync transactions (#12315)

`ComputeTxEnv` relied on `txIndex < len(block.Transactions())` which is
violated by Polygon's state sync event transaction. We handle this case
by adding an early return for this case, returning only ibs and
blockContext which is used during state sync event tracing.

Fixes #11701, #12007

turbo/transactions/tracing.go

@@ -46,9 +46,6 @@ func ComputeTxEnv(ctx context.Context, engine consensus.EngineReader, block *typ
 	// Create the parent state database
 	statedb := state.New(reader)
 
-	if txIndex == 0 && len(block.Transactions()) == 0 {
-		return nil, evmtypes.BlockContext{}, evmtypes.TxContext{}, statedb, reader, nil
-	}
 	getHeader := func(hash libcommon.Hash, n uint64) *types.Header {
 		h, _ := headerReader.HeaderByNumber(ctx, dbtx, n)
 		return h
@@ -60,6 +57,11 @@ func ComputeTxEnv(ctx context.Context, engine consensus.EngineReader, block *typ
 	// Recompute transactions up to the target index.
 	signer := types.MakeSigner(cfg, block.NumberU64(), block.Time())
 	if historyV3 {
+		if txIndex == len(block.Transactions()) {
+			// tx is a state sync transaction
+			return nil, blockContext, evmtypes.TxContext{}, statedb, reader, nil
+		}
+
 		rules := cfg.Rules(blockContext.BlockNumber, blockContext.Time)
 		txn := block.Transactions()[txIndex]
 		statedb.SetTxContext(txn.Hash(), block.Hash(), txIndex)
@@ -120,6 +122,12 @@ func ComputeTxEnv(ctx context.Context, engine consensus.EngineReader, block *typ
 			return nil, blockContext, evmtypes.TxContext{}, statedb, reader, nil
 		}
 	}
+
+	if txIndex == len(block.Transactions()) {
+		// tx is a state sync transaction
+		return nil, blockContext, evmtypes.TxContext{}, statedb, reader, nil
+	}
+
 	return nil, evmtypes.BlockContext{}, evmtypes.TxContext{}, nil, nil, fmt.Errorf("transaction index %d out of range for block %x", txIndex, block.Hash())
 }