core/vm: reuse bigint pools across transactions (#17070)

* core/vm: A pool for int pools

* core/vm: fix rebase issue

* core/vm: push leftover stack items after execution, not before

core/vm/interpreter.go

@@ -77,7 +77,6 @@ func NewInterpreter(evm *EVM, cfg Config) *Interpreter {
 		evm:      evm,
 		cfg:      cfg,
 		gasTable: evm.ChainConfig().GasTable(evm.BlockNumber),
-		intPool:  newIntPool(),
 	}
 }
 
@@ -104,6 +103,14 @@ func (in *Interpreter) enforceRestrictions(op OpCode, operation operation, stack
 // considered a revert-and-consume-all-gas operation except for
 // errExecutionReverted which means revert-and-keep-gas-left.
 func (in *Interpreter) Run(contract *Contract, input []byte) (ret []byte, err error) {
+	if in.intPool == nil {
+		in.intPool = poolOfIntPools.get()
+		defer func() {
+			poolOfIntPools.put(in.intPool)
+			in.intPool = nil
+		}()
+	}
+
 	// Increment the call depth which is restricted to 1024
 	in.evm.depth++
 	defer func() { in.evm.depth-- }()
@@ -133,6 +140,9 @@ func (in *Interpreter) Run(contract *Contract, input []byte) (ret []byte, err er
 	)
 	contract.Input = input
 
+	// Reclaim the stack as an int pool when the execution stops
+	defer func() { in.intPool.put(stack.data...) }()
+
 	if in.cfg.Debug {
 		defer func() {
 			if err != nil {