core/types: reduce allocations for transaction comparison

[MariusVanDerWijden]

This PR should reduce overall allocations of a running node by ~10 percent. Since most allocations are coming from the re-heaping of the transaction pool.

(pprof) list EffectiveGasTipCmp
Total: 38197204475
ROUTINE ======================== github.com/ethereum/go-ethereum/core/types.(*Transaction).EffectiveGasTipCmp in github.com/ethereum/go-ethereum/core/types/transaction.go
         0 3766837369 (flat, cum)  9.86% of Total
         .          .    386:func (tx *Transaction) EffectiveGasTipCmp(other *Transaction, baseFee *big.Int) int {
         .          .    387: if baseFee == nil {
         .          .    388:  return tx.GasTipCapCmp(other)
         .          .    389: }
         .          .    390: // Use more efficient internal method.
         .          .    391: txTip, otherTip := new(big.Int), new(big.Int)
         . 1796172553    392: tx.calcEffectiveGasTip(txTip, baseFee)
         . 1970664816    393: other.calcEffectiveGasTip(otherTip, baseFee)
         .          .    394: return txTip.Cmp(otherTip)
         .          .    395:}
         .          .    396:
         .          .    397:// EffectiveGasTipIntCmp compares the effective gasTipCap of a transaction to the given gasTipCap.
         .          .    398:func (tx *Transaction) EffectiveGasTipIntCmp(other *big.Int, baseFee *big.Int) int {

This PR reduces the allocations for comparing two transactions from 2 to 0:

goos: linux
goarch: amd64
pkg: github.com/ethereum/go-ethereum/core/types
cpu: Intel(R) Core(TM) Ultra 7 155U
                               │ /tmp/old.txt │            /tmp/new.txt             │
                               │    sec/op    │   sec/op     vs base                │
EffectiveGasTipCmp/Original-14    64.67n ± 2%   25.13n ± 9%  -61.13% (p=0.000 n=10)

                               │ /tmp/old.txt │            /tmp/new.txt            │
                               │     B/op     │   B/op     vs base                 │
EffectiveGasTipCmp/Original-14     16.00 ± 0%   0.00 ± 0%  -100.00% (p=0.000 n=10)

                               │ /tmp/old.txt │            /tmp/new.txt             │
                               │  allocs/op   │ allocs/op   vs base                 │
EffectiveGasTipCmp/Original-14     2.000 ± 0%   0.000 ± 0%  -100.00% (p=0.000 n=10)

It also speeds up the process by ~60%

There are two minor caveats with this PR:

• We change the API for EffectiveGasTipCmp and EffectiveGasTipIntCmp (which are probably not used by much)
• We slightly change the behavior of tx.EffectiveGasTip when it returns an error. It would previously return a negative number on error, now it does not (since uint256 does not allow for negative numbers)

[fjl]

Maybe should check for overflow here?