compiler/protogen: remove now-unnecessary UnsafeEnabled checks

This should have been part of CL 606755.

related to golang/protobuf#1640

Change-Id: Iae1bfb9e3bd440f879047d3a78e1bba364d7568c
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/607775
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Christian Höppner <hoeppi@google.com>

cmd/protoc-gen-go/internal_gengo/main.go

@@ -537,12 +537,10 @@ func genMessageBaseMethods(g *protogen.GeneratedFile, f *fileInfo, m *messageInf
 	// Reset method.
 	g.P("func (x *", m.GoIdent, ") Reset() {")
 	g.P("*x = ", m.GoIdent, "{}")
-	g.P("if ", protoimplPackage.Ident("UnsafeEnabled"), " {")
 	g.P("mi := &", messageTypesVarName(f), "[", f.allMessagesByPtr[m], "]")
 	g.P("ms := ", protoimplPackage.Ident("X"), ".MessageStateOf(", protoimplPackage.Ident("Pointer"), "(x))")
 	g.P("ms.StoreMessageInfo(mi)")
 	g.P("}")
-	g.P("}")
 	g.P()
 
 	// String method.

cmd/protoc-gen-go/internal_gengo/reflect.go

@@ -310,7 +310,7 @@ func genMessageReflectMethods(g *protogen.GeneratedFile, f *fileInfo, m *message
 	// ProtoReflect method.
 	g.P("func (x *", m.GoIdent, ") ProtoReflect() ", protoreflectPackage.Ident("Message"), " {")
 	g.P("mi := &", typesVar, "[", idx, "]")
-	g.P("if ", protoimplPackage.Ident("UnsafeEnabled"), " && x != nil {")
+	g.P("if x != nil {")
 	g.P("ms := ", protoimplPackage.Ident("X"), ".MessageStateOf(", protoimplPackage.Ident("Pointer"), "(x))")
 	g.P("if ms.LoadMessageInfo() == nil {")
 	g.P("ms.StoreMessageInfo(mi)")

cmd/protoc-gen-go/testdata/annotations/annotations.pb.go.meta

@@ -1 +1 @@
-annotation:{path:5 path:0 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:512 end:531} annotation:{path:5 path:0 path:2 path:0 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:548 end:595} annotation:{path:4 path:0 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:1954 end:1976} annotation:{path:4 path:0 path:2 path:0 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:2136 end:2156} annotation:{path:4 path:0 path:2 path:1 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:2256 end:2266} annotation:{path:4 path:0 path:2 path:0 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:3397 end:3420} annotation:{path:4 path:0 path:2 path:1 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:3563 end:3567} annotation:{path:4 path:0 path:2 path:1 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:3730 end:3734 semantic:SET}
+annotation:{path:5 path:0 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:512 end:531} annotation:{path:5 path:0 path:2 path:0 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:548 end:595} annotation:{path:4 path:0 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:1954 end:1976} annotation:{path:4 path:0 path:2 path:0 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:2136 end:2156} annotation:{path:4 path:0 path:2 path:1 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:2256 end:2266} annotation:{path:4 path:0 path:2 path:0 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:3334 end:3357} annotation:{path:4 path:0 path:2 path:1 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:3500 end:3504} annotation:{path:4 path:0 path:2 path:1 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:3667 end:3671 semantic:SET}