fix gcc 8 compiler warnings

There were two newly enabled warnings:
1. cast for a function pointers. Affected sql_analyse.h, mi_write.c
   and ma_write.cc, mf_iocache-t.cc, mysqlbinlog.cc, encryption.cc, etc

2. memcpy/memset of nontrivial structures. Fixed as:
* the warning disabled for InnoDB
* TABLE, TABLE_SHARE, and TABLE_LIST got a new method reset() which
  does the bzero(), which is safe for these classes, but any other
  bzero() will still cause a warning
* Table_scope_and_contents_source_st uses `TABLE_LIST *` (trivial)
  instead of `SQL_I_List<TABLE_LIST>` (not trivial) so it's safe to
  bzero now.
* added casts in debug_sync.cc and sql_select.cc (for JOIN)
* move assignment method for MDL_request instead of memcpy()
* PARTIAL_INDEX_INTERSECT_INFO::init() instead of bzero()
* remove constructor from READ_RECORD() to make it trivial
* replace some memcpy() with c++ copy assignments

1 files changed, 3 insertions, 3 deletions

diff --git a/sql/debug_sync.cc b/sql/debug_sync.cc
index f6291ca7acc..3dfbcdbcf81 100644
--- a/sql/debug_sync.cc
+++ b/sql/debug_sync.cc
@@ -584,7 +584,7 @@ static void debug_sync_remove_action(st_debug_sync_control *ds_control,
     memmove(save_action, action, sizeof(st_debug_sync_action));
 
     /* Move actions down. */
-    memmove(ds_control->ds_action + dsp_idx,
+    memmove((void*)(ds_control->ds_action + dsp_idx),
             ds_control->ds_action + dsp_idx + 1,
             (ds_control->ds_active - dsp_idx) *
             sizeof(st_debug_sync_action));
@@ -595,8 +595,8 @@ static void debug_sync_remove_action(st_debug_sync_control *ds_control,
       produced by the shift. Again do not use an assignment operator to
       avoid string allocation/copy.
     */
-    memmove(ds_control->ds_action + ds_control->ds_active, save_action,
-            sizeof(st_debug_sync_action));
+    memmove((void*)(ds_control->ds_action + ds_control->ds_active),
+            save_action, sizeof(st_debug_sync_action));
   }
 
   DBUG_VOID_RETURN;