DISCARD_COMMITMENT=true produce commitment for genesis (#12994)

Co-authored-by: awskii <[email protected]>

erigon-lib/state/domain_shared.go

@@ -1109,7 +1109,6 @@ func (sd *SharedDomains) Tx() kv.Tx { return sd.roTx }
 
 type SharedDomainsCommitmentContext struct {
 	sharedDomains *SharedDomains
-	discard       bool // could be replaced with using ModeDisabled
 	branches      map[string]cachedBranch
 	keccak        cryptozerocopy.KeccakState
 	updates       *commitment.Updates
@@ -1126,7 +1125,6 @@ func (sdc *SharedDomainsCommitmentContext) SetLimitReadAsOfTxNum(txNum uint64) {
 func NewSharedDomainsCommitmentContext(sd *SharedDomains, mode commitment.Mode, trieVariant commitment.TrieVariant) *SharedDomainsCommitmentContext {
 	ctx := &SharedDomainsCommitmentContext{
 		sharedDomains: sd,
-		discard:       dbg.DiscardCommitment(),
 		branches:      make(map[string]cachedBranch),
 		keccak:        sha3.NewLegacyKeccak256().(cryptozerocopy.KeccakState),
 	}
@@ -1310,7 +1308,7 @@ func (sdc *SharedDomainsCommitmentContext) KeysCount() uint64 {
 // TouchPlainKey marks plainKey as updated and applies different fn for different key types
 // (different behaviour for Code, Account and Storage key modifications).
 func (sdc *SharedDomainsCommitmentContext) TouchKey(d kv.Domain, key string, val []byte) {
-	if sdc.discard {
+	if sdc.updates.Mode() == commitment.ModeDisabled {
 		return
 	}
 
@@ -1328,10 +1326,6 @@ func (sdc *SharedDomainsCommitmentContext) TouchKey(d kv.Domain, key string, val
 
 // Evaluates commitment for processed state.
 func (sdc *SharedDomainsCommitmentContext) ComputeCommitment(ctx context.Context, saveState bool, blockNum uint64, logPrefix string) (rootHash []byte, err error) {
-	if dbg.DiscardCommitment() {
-		sdc.updates.Reset()
-		return nil, nil
-	}
 	sdc.ResetBranchCache()
 	defer sdc.ResetBranchCache()
 
@@ -1434,9 +1428,6 @@ func _decodeTxBlockNums(v []byte) (txNum, blockNum uint64) {
 // LatestCommitmentState searches for last encoded state for CommitmentContext.
 // Found value does not become current state.
 func (sdc *SharedDomainsCommitmentContext) LatestCommitmentState() (blockNum, txNum uint64, state []byte, err error) {
-	if dbg.DiscardCommitment() {
-		return 0, 0, nil, nil
-	}
 	if sdc.patriciaTrie.Variant() != commitment.VariantHexPatriciaTrie {
 		return 0, 0, nil, fmt.Errorf("state storing is only supported hex patricia trie")
 	}