Huff decs: Fix/suppress more innocuous UBSan errs

- UBSan complained that entropy->restarts_to_go was underflowing an
  unsigned integer when it was decremented while
  cinfo->restart_interval == 0.  That was, of course, completely
  innocuous behavior, since the result of the underflowing computation
  was never used.

- d3a3a73f64 and
  7bc9fca430 silenced a UBSan signed
  integer overflow error, but unfortunately other malformed JPEG images
  have been discovered that cause unsigned integer overflow in the same
  computation.  Since, to the best of our understanding, this behavior
  is innocuous, this commit reverts the commits listed above, suppresses
  the UBSan errors, and adds code comments to document the issue.

jdhuff.c

@@ -540,6 +540,12 @@ process_restart(j_decompress_ptr cinfo)
 }
 
 
+#if defined(__has_feature)
+#if __has_feature(undefined_behavior_sanitizer)
+__attribute__((no_sanitize("signed-integer-overflow"),
+               no_sanitize("unsigned-integer-overflow")))
+#endif
+#endif
 LOCAL(boolean)
 decode_mcu_slow(j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
 {
@@ -572,11 +578,15 @@ decode_mcu_slow(j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
     if (entropy->dc_needed[blkn]) {
       /* Convert DC difference to actual value, update last_dc_val */
       int ci = cinfo->MCU_membership[blkn];
-      /* This is really just
-       *   s += state.last_dc_val[ci];
-       * It is written this way in order to shut up UBSan.
+      /* Certain malformed JPEG images produce repeated DC coefficient
+       * differences of 2047 or -2047, which causes state.last_dc_val[ci] to
+       * grow until it overflows or underflows a 32-bit signed integer.  This
+       * behavior is, to the best of our understanding, innocuous, and it is
+       * unclear how to work around it without potentially affecting
+       * performance.  Thus, we (hopefully temporarily) suppress UBSan integer
+       * overflow errors for this function.
        */
-      s = (int)((unsigned int)s + (unsigned int)state.last_dc_val[ci]);
+      s += state.last_dc_val[ci];
       state.last_dc_val[ci] = s;
       if (block) {
         /* Output the DC coefficient (assumes jpeg_natural_order[0] = 0) */
@@ -671,7 +681,7 @@ decode_mcu_fast(j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
 
     if (entropy->dc_needed[blkn]) {
       int ci = cinfo->MCU_membership[blkn];
-      s = (int)((unsigned int)s + (unsigned int)state.last_dc_val[ci]);
+      s += state.last_dc_val[ci];
       state.last_dc_val[ci] = s;
       if (block)
         (*block)[0] = (JCOEF)s;
@@ -778,7 +788,8 @@ use_slow:
   }
 
   /* Account for restart interval (no-op if not using restarts) */
-  entropy->restarts_to_go--;
+  if (cinfo->restart_interval)
+    entropy->restarts_to_go--;
 
   return TRUE;
 }