Merge pull request #329 from OffchainLabs/add-stopopcode-flatcalltracer

Handle STOP opcode in flatCallTracer

Author: joshuacolvin0

eth/tracers/native/call_flat.go

@@ -294,7 +294,7 @@ func flatFromNested(input *callFrame, traceAddress []int, convertErrs bool, ctx
 		frame = newFlatCreate(input)
 	case vm.SELFDESTRUCT:
 		frame = newFlatSelfdestruct(input)
-	case vm.CALL, vm.STATICCALL, vm.CALLCODE, vm.DELEGATECALL, vm.INVALID:
+	case vm.CALL, vm.STATICCALL, vm.CALLCODE, vm.DELEGATECALL, vm.INVALID, vm.STOP:
 		frame = newFlatCall(input)
 	default:
 		return nil, fmt.Errorf("unrecognized call frame type: %s", input.Type)