prog_test: compare BTF program tags instead of raw insns

To prepare for Instruction no longer being comparable, remove the only test
that directly compares Instructions. Comparing instruction streams should be
done using Instructions.Tag().

Re-introduce a map load as in 9c06a48, as it
was removed to avoid having to overwrite the map fd with an id in xlated insns.

Signed-off-by: Timo Beckers <timo@isovalent.com>

prog_test.go

@@ -687,12 +687,16 @@ func TestProgramBindMap(t *testing.T) {
 }
 
 func TestProgramInstructions(t *testing.T) {
+	arr := createArray(t)
+	defer arr.Close()
+
 	name := "test_prog"
 	spec := &ProgramSpec{
 		Type: SocketFilter,
 		Name: name,
 		Instructions: asm.Instructions{
 			asm.LoadImm(asm.R0, -1, asm.DWord).Sym(name),
+			asm.LoadMapPtr(asm.R1, arr.FD()),
 			asm.Mov.Imm32(asm.R0, 0),
 			asm.Return(),
 		},
@@ -716,8 +720,18 @@ func TestProgramInstructions(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	if diff := cmp.Diff(insns, spec.Instructions); diff != "" {
-		t.Fatal(diff)
+	tag, err := spec.Tag()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	tagXlated, err := insns.Tag(internal.NativeEndian)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if tag != tagXlated {
+		t.Fatalf("tag %s differs from xlated instructions tag %s", tag, tagXlated)
 	}
 }