[CP] Split prepare stmt memory to tenants

unittest/share/allocator/test_reserve_arena_allocator.cpp

@@ -36,7 +36,7 @@ public:
   ObReserveArenaAllocator<1024> test_allocator_;
 };
 TestReserveArenaAllocator::TestReserveArenaAllocator():
-    test_allocator_(ObModIds::OB_STORE_ROW_EXISTER, OB_MALLOC_NORMAL_BLOCK_SIZE, 500)
+  test_allocator_(ObMemAttr(500, ObModIds::OB_STORE_ROW_EXISTER), OB_MALLOC_NORMAL_BLOCK_SIZE)
 {
 }
 
@@ -151,4 +151,4 @@ int main(int argc, char **argv)
   srand(time(NULL));
   testing::InitGoogleTest(&argc, argv);
   return RUN_ALL_TESTS();
-}
+}