core: types: less allocations when hashing and tx handling (#21265)

* core, crypto: various allocation savings regarding tx handling

* core: reduce allocs for gas price comparison

This change reduces the allocations needed for comparing different transactions to each other.
A call to `tx.GasPrice()` copies the gas price as it has to be safe against modifications and
also needs to be threadsafe. For comparing and ordering different transactions we don't need
these guarantees

* core: added tx.GasPriceIntCmp for comparison without allocation

adds a method to remove unneeded allocation in comparison to tx.gasPrice

* core/types: pool legacykeccak256 objects in rlpHash

rlpHash is by far the most used function in core that allocates a legacyKeccak256 object on each call.
Since it is so widely used it makes sense to add pooling here so we relieve the GC.
On my machine these changes result in > 100 MILLION less allocations and > 30 GB less allocated memory.

* reverted some changes

* reverted some changes

* trie: use crypto.KeccakState instead of replicating code

Co-authored-by: Martin Holst Swende <martin@swende.se>

trie/committer.go

@@ -22,6 +22,7 @@ import (
 	"sync"
 
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/rlp"
 	"golang.org/x/crypto/sha3"
 )
@@ -46,7 +47,7 @@ type leaf struct {
 // processed sequentially - onleaf will never be called in parallel or out of order.
 type committer struct {
 	tmp sliceBuffer
-	sha keccakState
+	sha crypto.KeccakState
 
 	onleaf LeafCallback
 	leafCh chan *leaf
@@ -57,7 +58,7 @@ var committerPool = sync.Pool{
 	New: func() interface{} {
 		return &committer{
 			tmp: make(sliceBuffer, 0, 550), // cap is as large as a full fullNode.
-			sha: sha3.NewLegacyKeccak256().(keccakState),
+			sha: sha3.NewLegacyKeccak256().(crypto.KeccakState),
 		}
 	},
 }