compilation fix

include/my_valgrind.h:88:112: error: ‘void* memset(void*, int, size_t)’ writing to an object of non-trivial type ‘key_map’ {aka ‘class Bitmap<64>’}; use assignment instead [-Werror=class-memaccess]

in this case it's safe, Bitmap<> is trivial enough

sql/table.cc

@@ -9932,7 +9932,7 @@ bool TABLE::export_structure(THD *thd, Row_definition_list *defs)
 
 void TABLE::initialize_opt_range_structures()
 {
-  TRASH_ALLOC(&opt_range_keys, sizeof(opt_range_keys));
+  TRASH_ALLOC((void*)&opt_range_keys, sizeof(opt_range_keys));
   TRASH_ALLOC(opt_range, s->keys * sizeof(*opt_range));
   TRASH_ALLOC(const_key_parts, s->keys * sizeof(*const_key_parts));
 }