Remove ASSERT_POD

Newer compilers / language allows structs with constructor in union.
So, this was not actually testing anything.  Indeed, the recent
change in DISALLOW_COPY *is* making some of our types non-POD.
That broke some bots.

Just remove this since it wasn't doing much, and I'd rather have
DISALLOW_COPY.

src/hb-blob.hh

@@ -69,7 +69,6 @@ struct hb_blob_t
 
   public:
   hb_object_header_t header;
-  ASSERT_POD ();
 
   bool immutable;
 

src/hb-buffer.hh

@@ -86,7 +86,6 @@ HB_MARK_AS_FLAG_T (hb_buffer_scratch_flags_t);
 struct hb_buffer_t
 {
   hb_object_header_t header;
-  ASSERT_POD ();
 
   /* Information about how the text in the buffer should be treated */
   hb_unicode_funcs_t *unicode; /* Unicode functions */

src/hb-face.hh

@@ -42,7 +42,6 @@
 struct hb_face_t
 {
   hb_object_header_t header;
-  ASSERT_POD ();
 
   hb_bool_t immutable;
 

src/hb-font.hh

@@ -62,7 +62,6 @@
 struct hb_font_funcs_t
 {
   hb_object_header_t header;
-  ASSERT_POD ();
 
   hb_bool_t immutable;
 
@@ -102,7 +101,6 @@ DECLARE_NULL_INSTANCE (hb_font_funcs_t);
 struct hb_font_t
 {
   hb_object_header_t header;
-  ASSERT_POD ();
 
   hb_bool_t immutable;
 

src/hb-machinery.hh

@@ -82,10 +82,7 @@ static inline Type& StructAfter(TObject &X)
 /* Check _assertion in a method environment */
 #define _DEFINE_INSTANCE_ASSERTION1(_line, _assertion) \
   inline void _instance_assertion_on_line_##_line (void) const \
-  { \
+  { static_assert ((_assertion), ""); }
-    static_assert ((_assertion), ""); \
-    ASSERT_INSTANCE_POD (*this); /* Make sure it's POD. */ \
-  }
 # define _DEFINE_INSTANCE_ASSERTION0(_line, _assertion) _DEFINE_INSTANCE_ASSERTION1 (_line, _assertion)
 # define DEFINE_INSTANCE_ASSERTION(_assertion) _DEFINE_INSTANCE_ASSERTION0 (__LINE__, _assertion)
 

src/hb-object.hh

@@ -195,12 +195,8 @@ struct hb_object_header_t
 {
   hb_reference_count_t ref_count;
   hb_atomic_ptr_t<hb_user_data_array_t> user_data;
-
-#define HB_OBJECT_HEADER_STATIC {HB_REFERENCE_COUNT_INIT, HB_ATOMIC_PTR_INIT (nullptr)}
-
-  private:
-  ASSERT_POD ();
 };
+#define HB_OBJECT_HEADER_STATIC {HB_REFERENCE_COUNT_INIT, HB_ATOMIC_PTR_INIT (nullptr)}
 
 
 /*

src/hb-ot-shape-complex-arabic-fallback.hh

@@ -194,8 +194,6 @@ arabic_fallback_synthesize_lookup (const hb_ot_shape_plan_t *plan,
 
 struct arabic_fallback_plan_t
 {
-  ASSERT_POD ();
-
   unsigned int num_lookups;
   bool free_lookups;
 

src/hb-ot-shape-complex-arabic.cc

@@ -243,8 +243,6 @@ collect_features_arabic (hb_ot_shape_planner_t *plan)
 
 struct arabic_shape_plan_t
 {
-  ASSERT_POD ();
-
   /* The "+ 1" in the next array is to accommodate for the "NONE" command,
    * which is not an OpenType feature, but this simplifies the code by not
    * having to do a "if (... < NONE) ..." and just rely on the fact that

src/hb-ot-shape-complex-hangul.cc

@@ -70,8 +70,6 @@ override_features_hangul (hb_ot_shape_planner_t *plan)
 
 struct hangul_shape_plan_t
 {
-  ASSERT_POD ();
-
   hb_mask_t mask_array[HANGUL_FEATURE_COUNT];
 };
 

src/hb-ot-shape-complex-indic.cc

@@ -252,8 +252,6 @@ struct would_substitute_feature_t
 
 struct indic_shape_plan_t
 {
-  ASSERT_POD ();
-
   inline bool load_virama_glyph (hb_font_t *font, hb_codepoint_t *pglyph) const
   {
     hb_codepoint_t glyph = virama_glyph.get_relaxed ();

src/hb-ot-shape-complex-khmer.cc

@@ -174,8 +174,6 @@ struct would_substitute_feature_t
 
 struct khmer_shape_plan_t
 {
-  ASSERT_POD ();
-
   inline bool get_virama_glyph (hb_font_t *font, hb_codepoint_t *pglyph) const
   {
     hb_codepoint_t glyph = virama_glyph;

src/hb-ot-shape-complex-use.cc

@@ -171,8 +171,6 @@ collect_features_use (hb_ot_shape_planner_t *plan)
 
 struct use_shape_plan_t
 {
-  ASSERT_POD ();
-
   hb_mask_t rphf_mask;
 
   arabic_shape_plan_t *arabic_plan;

src/hb-set-digest.hh

@@ -48,8 +48,6 @@
 template <typename mask_t, unsigned int shift>
 struct hb_set_digest_lowest_bits_t
 {
-  ASSERT_POD ();
-
   enum { mask_bytes = sizeof (mask_t) };
   enum { mask_bits = sizeof (mask_t) * 8 };
   static const unsigned int num_bits = 0
@@ -117,8 +115,6 @@ struct hb_set_digest_lowest_bits_t
 template <typename head_t, typename tail_t>
 struct hb_set_digest_combiner_t
 {
-  ASSERT_POD ();
-
   inline void init (void) {
     head.init ();
     tail.init ();

src/hb-shape-plan.hh

@@ -34,7 +34,6 @@
 struct hb_shape_plan_t
 {
   hb_object_header_t header;
-  ASSERT_POD ();
 
   hb_bool_t default_shaper_list;
   hb_face_t *face_unsafe; /* We don't carry a reference to face. */

src/hb-subset-input.hh

@@ -37,7 +37,6 @@
 struct hb_subset_input_t
 {
   hb_object_header_t header;
-  ASSERT_POD ();
 
   hb_set_t *unicodes;
   hb_set_t *glyphs;

src/hb-subset-plan.hh

@@ -37,7 +37,6 @@
 struct hb_subset_plan_t
 {
   hb_object_header_t header;
-  ASSERT_POD ();
 
   bool drop_hints : 1;
   bool drop_layout : 1;

src/hb-unicode.hh

@@ -63,7 +63,6 @@ extern HB_INTERNAL const uint8_t _hb_modified_combining_class[256];
 struct hb_unicode_funcs_t
 {
   hb_object_header_t header;
-  ASSERT_POD ();
 
   hb_unicode_funcs_t *parent;
 

src/hb.hh

@@ -337,32 +337,6 @@ static_assert ((sizeof (hb_mask_t) == 4), "");
 static_assert ((sizeof (hb_var_int_t) == 4), "");
 
 
-/* We like our types POD */
-
-#define _ASSERT_TYPE_POD1(_line, _type)	union _type_##_type##_on_line_##_line##_is_not_POD { _type instance; }
-#define _ASSERT_TYPE_POD0(_line, _type)	_ASSERT_TYPE_POD1 (_line, _type)
-#define ASSERT_TYPE_POD(_type)		_ASSERT_TYPE_POD0 (__LINE__, _type)
-
-#ifdef __GNUC__
-# define _ASSERT_INSTANCE_POD1(_line, _instance) \
-	HB_STMT_START { \
-		typedef __typeof__(_instance) _type_##_line; \
-		_ASSERT_TYPE_POD1 (_line, _type_##_line); \
-	} HB_STMT_END
-#else
-# define _ASSERT_INSTANCE_POD1(_line, _instance)	typedef int _assertion_on_line_##_line##_not_tested
-#endif
-# define _ASSERT_INSTANCE_POD0(_line, _instance)	_ASSERT_INSTANCE_POD1 (_line, _instance)
-# define ASSERT_INSTANCE_POD(_instance)			_ASSERT_INSTANCE_POD0 (__LINE__, _instance)
-
-/* Check _assertion in a method environment */
-#define _ASSERT_POD1(_line) \
-	HB_UNUSED inline void _static_assertion_on_line_##_line (void) const \
-	{ _ASSERT_INSTANCE_POD1 (_line, *this); /* Make sure it's POD. */ }
-# define _ASSERT_POD0(_line)	_ASSERT_POD1 (_line)
-# define ASSERT_POD()		_ASSERT_POD0 (__LINE__)
-
-
 #define HB_DISALLOW_COPY_AND_ASSIGN(TypeName) \
   TypeName(const TypeName&); \
   void operator=(const TypeName&)