`(gogoproto.stdtime) = true` causes low marshal performance

[TennyZhuang]

gogo/protobuf/types.Timestamp is generated by protoc-gen-gogo and imports gogo/protobuf/proto.

To avoid cycling import, gogo/protobuf implement a fake timestamp .

protobuf/proto/timestamp_gogo.go

Lines 38 to 46 in 5628607

	type timestamp struct {
	Seconds int64 `protobuf:"varint,1,opt,name=seconds,proto3" json:"seconds,omitempty"`
	Nanos int32 `protobuf:"varint,2,opt,name=nanos,proto3" json:"nanos,omitempty"`
	}
	func (m *timestamp) Reset() { *m = timestamp{} }
	func (*timestamp) ProtoMessage() {}
	func (*timestamp) String() string { return "timestamp<string>" }

And it does not implement newMarshaler or Marshaler interface, which will cause the Marshal use the slowest path.

protobuf/proto/table_marshal.go

Lines 2951 to 2954 in 5628607

	var info InternalMessageInfo
	siz := info.Size(pb)
	b := make([]byte, 0, siz)
	return info.Marshal(b, pb, false)

Then the global marshal info lock will be performance bottleneck.

protobuf/proto/table_marshal.go

Lines 107 to 116 in 5628607

	func getMarshalInfo(t reflect.Type) *marshalInfo {
	marshalInfoLock.Lock()
	u, ok := marshalInfoMap[t]
	if !ok {
	u = &marshalInfo{typ: t}
	marshalInfoMap[t] = u
	}
	marshalInfoLock.Unlock()
	return u
	}

A simple workaround fix is #655

A better solution is use a real Timestamp instead of a fake timestamp.

To avoid cycling import, we can import golang/protobuf and use Timestamp generated by golang protobuf.

import ptimestamp "github.com/golang/protobuf/ptypes/timestamp"

type timestamp = ptimestamp.Timestamp

Then the performance will be highly improved.

[TennyZhuang]

I'd like to fix it if the solution is acceptable.

[TennyZhuang]

@awalterschulze @jmarais PTAL

[xujianhai666]

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