Fixed bug in convenient constructors for Java/C#

Also fixed Go unit tests not being up to date with recent schema
changes.

Change-Id: I42e619f9c5ea05f6f937c68a5c8a92462c46bce3
Tested: on Linux and Windows.

tests/MyGame/Example/Stat.go

@@ -0,0 +1,36 @@
+// automatically generated, do not modify
+
+package Example
+
+import (
+	flatbuffers "github.com/google/flatbuffers/go"
+)
+type Stat struct {
+	_tab flatbuffers.Table
+}
+
+func (rcv *Stat) Init(buf []byte, i flatbuffers.UOffsetT) {
+	rcv._tab.Bytes = buf
+	rcv._tab.Pos = i
+}
+
+func (rcv *Stat) Id() string {
+	o := flatbuffers.UOffsetT(rcv._tab.Offset(4))
+	if o != 0 {
+		return rcv._tab.String(o + rcv._tab.Pos)
+	}
+	return ""
+}
+
+func (rcv *Stat) Val() int64 {
+	o := flatbuffers.UOffsetT(rcv._tab.Offset(6))
+	if o != 0 {
+		return rcv._tab.GetInt64(o + rcv._tab.Pos)
+	}
+	return 0
+}
+
+func StatStart(builder *flatbuffers.Builder) { builder.StartObject(2) }
+func StatAddId(builder *flatbuffers.Builder, id flatbuffers.UOffsetT) { builder.PrependUOffsetTSlot(0, flatbuffers.UOffsetT(id), 0) }
+func StatAddVal(builder *flatbuffers.Builder, val int64) { builder.PrependInt64Slot(1, val, 0) }
+func StatEnd(builder *flatbuffers.Builder) flatbuffers.UOffsetT { return builder.EndObject() }