cmd/protoc-gen-go: special cases for MessageSet extensions

Add special-case handling for extension fields named
"message_set_extension" that extend a message_set_wire_format message.

Support special cases for a proto1 feature that was superseded by proto2
extensions.

Change-Id: Icbdb711111c66be547bf8d6f37ab3079c320e2a1
Reviewed-on: https://go-review.googlesource.com/136536
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
diff --git a/cmd/protoc-gen-go/testdata/proto2/enum.pb.go b/cmd/protoc-gen-go/testdata/proto2/enum.pb.go
index b592bd0..6e5cf27 100644
--- a/cmd/protoc-gen-go/testdata/proto2/enum.pb.go
+++ b/cmd/protoc-gen-go/testdata/proto2/enum.pb.go
@@ -322,34 +322,34 @@
 var xxx_messageInfo_EnumContainerMessage1_EnumContainerMessage2 proto.InternalMessageInfo
 
 func init() {
-	proto.RegisterType((*EnumContainerMessage1)(nil), "goproto.protoc.proto2.EnumContainerMessage1")
-	proto.RegisterType((*EnumContainerMessage1_EnumContainerMessage2)(nil), "goproto.protoc.proto2.EnumContainerMessage1.EnumContainerMessage2")
 	proto.RegisterEnum("goproto.protoc.proto2.EnumType1", EnumType1_name, EnumType1_value)
 	proto.RegisterEnum("goproto.protoc.proto2.EnumType2", EnumType2_name, EnumType2_value)
 	proto.RegisterEnum("goproto.protoc.proto2.EnumContainerMessage1_NestedEnumType1A", EnumContainerMessage1_NestedEnumType1A_name, EnumContainerMessage1_NestedEnumType1A_value)
 	proto.RegisterEnum("goproto.protoc.proto2.EnumContainerMessage1_NestedEnumType1B", EnumContainerMessage1_NestedEnumType1B_name, EnumContainerMessage1_NestedEnumType1B_value)
 	proto.RegisterEnum("goproto.protoc.proto2.EnumContainerMessage1_EnumContainerMessage2_NestedEnumType2A", EnumContainerMessage1_EnumContainerMessage2_NestedEnumType2A_name, EnumContainerMessage1_EnumContainerMessage2_NestedEnumType2A_value)
 	proto.RegisterEnum("goproto.protoc.proto2.EnumContainerMessage1_EnumContainerMessage2_NestedEnumType2B", EnumContainerMessage1_EnumContainerMessage2_NestedEnumType2B_name, EnumContainerMessage1_EnumContainerMessage2_NestedEnumType2B_value)
+	proto.RegisterType((*EnumContainerMessage1)(nil), "goproto.protoc.proto2.EnumContainerMessage1")
+	proto.RegisterType((*EnumContainerMessage1_EnumContainerMessage2)(nil), "goproto.protoc.proto2.EnumContainerMessage1.EnumContainerMessage2")
 }
 
 func init() { proto.RegisterFile("proto2/enum.proto", fileDescriptor_de9f68860d540858) }
 
 var fileDescriptor_de9f68860d540858 = []byte{
-	// 242 bytes of a gzipped FileDescriptorProto
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+	0x5b, 0x88, 0x8a, 0x80, 0x94, 0x01, 0x00, 0x00,
 }
diff --git a/cmd/protoc-gen-go/testdata/proto2/fields.pb.go b/cmd/protoc-gen-go/testdata/proto2/fields.pb.go
index bba5924..c922a2b 100644
--- a/cmd/protoc-gen-go/testdata/proto2/fields.pb.go
+++ b/cmd/protoc-gen-go/testdata/proto2/fields.pb.go
@@ -1585,6 +1585,7 @@
 var xxx_messageInfo_FieldTestMessage_Message proto.InternalMessageInfo
 
 func init() {
+	proto.RegisterEnum("goproto.protoc.proto2.FieldTestMessage_Enum", FieldTestMessage_Enum_name, FieldTestMessage_Enum_value)
 	proto.RegisterType((*FieldTestMessage)(nil), "goproto.protoc.proto2.FieldTestMessage")
 	proto.RegisterMapType((map[uint64]FieldTestMessage_Enum)(nil), "goproto.protoc.proto2.FieldTestMessage.MapFixed64EnumEntry")
 	proto.RegisterMapType((map[int32]int64)(nil), "goproto.protoc.proto2.FieldTestMessage.MapInt32Int64Entry")
@@ -1594,126 +1595,125 @@
 	proto.RegisterType((*FieldTestMessage_RepeatedGroup)(nil), "goproto.protoc.proto2.FieldTestMessage.RepeatedGroup")
 	proto.RegisterType((*FieldTestMessage_OneofGroup)(nil), "goproto.protoc.proto2.FieldTestMessage.OneofGroup")
 	proto.RegisterType((*FieldTestMessage_Message)(nil), "goproto.protoc.proto2.FieldTestMessage.Message")
-	proto.RegisterEnum("goproto.protoc.proto2.FieldTestMessage_Enum", FieldTestMessage_Enum_name, FieldTestMessage_Enum_value)
 }
 
 func init() { proto.RegisterFile("proto2/fields.proto", fileDescriptor_fd8a9d72b841fd68) }
 
 var fileDescriptor_fd8a9d72b841fd68 = []byte{
-	// 1825 bytes of a gzipped FileDescriptorProto
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+	0xb1, 0xdf, 0x80, 0x2c, 0x16, 0x00, 0x00,
 }
diff --git a/cmd/protoc-gen-go/testdata/proto2/nested_messages.pb.go b/cmd/protoc-gen-go/testdata/proto2/nested_messages.pb.go
index 1daa2eb..0f8b3ee 100644
--- a/cmd/protoc-gen-go/testdata/proto2/nested_messages.pb.go
+++ b/cmd/protoc-gen-go/testdata/proto2/nested_messages.pb.go
@@ -146,7 +146,7 @@
 func init() { proto.RegisterFile("proto2/nested_messages.proto", fileDescriptor_7417ee157699d191) }
 
 var fileDescriptor_7417ee157699d191 = []byte{
-	// 184 bytes of a gzipped FileDescriptorProto
+	// 190 bytes of a gzipped FileDescriptorProto
 	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0x92, 0x29, 0x28, 0xca, 0x2f,
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@@ -154,9 +154,9 @@
 	0x63, 0x24, 0xc1, 0xa8, 0xc0, 0xa8, 0xc1, 0x6d, 0xa4, 0xa2, 0x87, 0x55, 0xb9, 0x1e, 0x44, 0x29,
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-	0x47, 0x0d, 0xa3, 0x19, 0x41, 0x01, 0x00, 0x00,
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 }
diff --git a/cmd/protoc-gen-go/testdata/proto2/proto2.pb.go b/cmd/protoc-gen-go/testdata/proto2/proto2.pb.go
index a912199..1cb5191 100644
--- a/cmd/protoc-gen-go/testdata/proto2/proto2.pb.go
+++ b/cmd/protoc-gen-go/testdata/proto2/proto2.pb.go
@@ -74,15 +74,15 @@
 func init() { proto.RegisterFile("proto2/proto2.proto", fileDescriptor_d756bbe8817c03c1) }
 
 var fileDescriptor_d756bbe8817c03c1 = []byte{
-	// 146 bytes of a gzipped FileDescriptorProto
+	// 152 bytes of a gzipped FileDescriptorProto
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+	0x85, 0x42, 0x0d, 0x5f, 0xba, 0x00, 0x00, 0x00,
 }