8205940: LoadNode::find_previous_arraycopy fails with "broken allocation" assert

Removed assert which is too strong.

Reviewed-by: roland
diff --git a/src/hotspot/share/opto/memnode.cpp b/src/hotspot/share/opto/memnode.cpp
index eb9cfe6..ffeeac6 100644
--- a/src/hotspot/share/opto/memnode.cpp
+++ b/src/hotspot/share/opto/memnode.cpp
@@ -518,8 +518,7 @@
       if (ac->is_clonebasic()) {
         intptr_t offset;
         AllocateNode* alloc = AllocateNode::Ideal_allocation(ac->in(ArrayCopyNode::Dest), phase, offset);
-        assert(alloc != NULL && (!ReduceBulkZeroing || alloc->initialization()->is_complete_with_arraycopy()), "broken allocation");
-        if (alloc == ld_alloc) {
+        if (alloc != NULL && alloc == ld_alloc) {
           return ac;
         }
       }