src/hotspot/share/opto/library_call.cpp

rev 49175 : 8198950: AArch64: org.openjdk.jcstress.tests.varhandles.DekkerTest fails
Summary: Fix breakage to AArch64 code generation caused by JDK-8181211
Reviewed-by: duke

*** 2576,2586 ****
      if (p == NULL) {
        // To be valid, unsafe loads may depend on other conditions than
        // the one that guards them: pin the Load node
        LoadNode::ControlDependency dep = LoadNode::Pinned;
        Node* ctrl = control();
!       if (adr_type->isa_instptr()) {
          assert(adr_type->meet(TypePtr::NULL_PTR) != adr_type->remove_speculative(), "should be not null");
          intptr_t offset = Type::OffsetBot;
          AddPNode::Ideal_base_and_offset(adr, &_gvn, offset);
          if (offset >= 0) {
            int s = Klass::layout_helper_size_in_bytes(adr_type->isa_instptr()->klass()->layout_helper());
--- 2576,2587 ----
      if (p == NULL) {
        // To be valid, unsafe loads may depend on other conditions than
        // the one that guards them: pin the Load node
        LoadNode::ControlDependency dep = LoadNode::Pinned;
        Node* ctrl = control();
!       // non volatile loads may be able to float
!       if (!need_mem_bar && adr_type->isa_instptr()) {
          assert(adr_type->meet(TypePtr::NULL_PTR) != adr_type->remove_speculative(), "should be not null");
          intptr_t offset = Type::OffsetBot;
          AddPNode::Ideal_base_and_offset(adr, &_gvn, offset);
          if (offset >= 0) {
            int s = Klass::layout_helper_size_in_bytes(adr_type->isa_instptr()->klass()->layout_helper());