Revert "[sanitize/Coverage] Keep a map of sane coverages"

This reverts commit a689114898cc3e8f1c6ba7cc49cd6c3639d91250.

src/OT/Layout/Common/Coverage.hh

@@ -62,30 +62,18 @@ struct Coverage
 #endif
   bool sanitize (hb_sanitize_context_t *c) const
   {
-    uintptr_t offset = (uintptr_t) this - (uintptr_t) c->start;
-    if (offset < HB_SET_VALUE_INVALID &&
-	c->sane_coverages.has ((hb_codepoint_t) offset))
-      return true;
-
-    bool ret;
-
     TRACE_SANITIZE (this);
     if (!u.format.sanitize (c)) return_trace (false);
     switch (u.format)
     {
-    case 1: ret = u.format1.sanitize (c); break;
-    case 2: ret = u.format2.sanitize (c); break;
+    case 1: return_trace (u.format1.sanitize (c));
+    case 2: return_trace (u.format2.sanitize (c));
 #ifndef HB_NO_BEYOND_64K
-    case 3: ret = u.format3.sanitize (c); break;
-    case 4: ret = u.format4.sanitize (c); break;
+    case 3: return_trace (u.format3.sanitize (c));
+    case 4: return_trace (u.format4.sanitize (c));
 #endif
-    default:ret = true; break;
+    default:return_trace (true);
     }
-
-    if (likely (offset < HB_SET_VALUE_INVALID && ret))
-      c->sane_coverages.set ((hb_codepoint_t) offset, 1);
-
-    return_trace (ret);
   }
 
   /* Has interface. */

src/hb-sanitize.hh

@@ -32,7 +32,6 @@
 #include "hb.hh"
 #include "hb-blob.hh"
 #include "hb-dispatch.hh"
-#include "hb-map.hh"
 
 
 /*
@@ -229,7 +228,6 @@ struct hb_sanitize_context_t :
     this->edit_count = 0;
     this->debug_depth = 0;
     this->recursion_depth = 0;
-    this->sane_coverages.clear ();
 
     DEBUG_MSG_LEVEL (SANITIZE, start, 0, +1,
 		     "start [%p..%p] (%lu bytes)",
@@ -507,7 +505,6 @@ struct hb_sanitize_context_t :
   bool  num_glyphs_set;
   public:
   bool lazy_some_gpos;
-  hb_map_t sane_coverages;
 };
 
 struct hb_sanitize_with_object_t