MDEV-21174 fixup: Remove mtr_t::release_page()

mtr_t::release_page(): Remove. The function became unused in
commit 56f6dab
when the call was replaced with a call to mtr_t::memo_release().

storage/innobase/include/mtr0mtr.h

@@ -282,10 +282,6 @@ struct mtr_t {
 	@param type	object type
 	@return bool if lock released */
 	bool memo_release(const void* object, ulint type);
-	/** Release a page latch.
-	@param[in]	ptr	pointer to within a page frame
-	@param[in]	type	object type: MTR_MEMO_PAGE_X_FIX, ... */
-	void release_page(const void* ptr, mtr_memo_type_t type);
 
 private:
   /** Note that the mini-transaction will modify data. */

storage/innobase/mtr/mtr0mtr.cc

@@ -757,29 +757,6 @@ mtr_t::memo_release(const void* object, ulint type)
 	return(false);
 }
 
-/** Release a page latch.
-@param[in]	ptr	pointer to within a page frame
-@param[in]	type	object type: MTR_MEMO_PAGE_X_FIX, ... */
-void
-mtr_t::release_page(const void* ptr, mtr_memo_type_t type)
-{
-	ut_ad(is_active());
-
-	/* We cannot release a page that has been written to in the
-	middle of a mini-transaction. */
-	ut_ad(!m_modifications || type != MTR_MEMO_PAGE_X_FIX);
-
-	Iterate<FindPage> iteration(FindPage(ptr, type));
-
-	if (!m_memo.for_each_block_in_reverse(iteration)) {
-		memo_slot_release(iteration.functor.get_slot());
-		return;
-	}
-
-	/* The page was not found! */
-	ut_ad(0);
-}
-
 static bool log_margin_warned;
 static time_t log_margin_warn_time;
 static bool log_close_warned;