--- old/src/share/vm/opto/memnode.cpp	2019-10-29 16:05:59.834126189 +0100
+++ new/src/share/vm/opto/memnode.cpp	2019-10-29 16:05:59.550125056 +0100
@@ -2485,7 +2485,9 @@
     assert(mem != mem->in(MemNode::Memory), "dead loop in StoreNode::Ideal");
 
     assert(Opcode() == mem->Opcode() ||
-           phase->C->get_alias_index(adr_type()) == Compile::AliasIdxRaw,
+           phase->C->get_alias_index(adr_type()) == Compile::AliasIdxRaw ||
+           (Opcode() == Op_StoreL && mem->Opcode() == Op_StoreI) || // expanded ClearArrayNode
+           (is_mismatched_access() || mem->as_Store()->is_mismatched_access()),
            "no mismatched stores, except on raw memory");
 
     if (mem->outcnt() == 1 &&           // check for intervening uses