fix(vm): remove go:nosplit from RunInstruction func (#683)

When debugging (with go-delve) some optimizations are skipped which
mean this function exceeds the maximum Go stack frame. When this
happens, Go usually splits the function but since there was an explicit
"nosplit" the code is unable to compile and makes impossible to debug
any functionality that uses `RunInstruction`.

pkg/vm/vm.go

@@ -169,7 +169,6 @@ func (vm *VirtualMachine) RunStep(hintRunner HintRunner) error {
 
 const RC_OFFSET_BITS = 16
 
-//go:nosplit
 func (vm *VirtualMachine) RunInstruction(instruction *asmb.Instruction) error {
 
 	var off0 int = int(instruction.OffDest) + (1 << (RC_OFFSET_BITS - 1))