8356780: PhaseMacroExpand::_has_locks is unused

Reviewed-by: mhaessig, chagedorn, kvn, mchevalier

Author: benoitmaillard

src/hotspot/share/opto/macro.cpp

@@ -2407,7 +2407,6 @@ void PhaseMacroExpand::eliminate_macro_nodes() {
     }
   }
   // Next, attempt to eliminate allocations
-  _has_locks = false;
   progress = true;
   while (progress) {
     progress = false;
@@ -2431,7 +2430,6 @@ void PhaseMacroExpand::eliminate_macro_nodes() {
       case Node::Class_Lock:
       case Node::Class_Unlock:
         assert(!n->as_AbstractLock()->is_eliminated(), "sanity");
-        _has_locks = true;
         break;
       case Node::Class_ArrayCopy:
         break;

src/hotspot/share/opto/macro.hpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2005, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -83,9 +83,6 @@ class PhaseMacroExpand : public Phase {
   // projections extracted from a call node
   CallProjections _callprojs;
 
-  // Additional data collected during macro expansion
-  bool _has_locks;
-
   void expand_allocate(AllocateNode *alloc);
   void expand_allocate_array(AllocateArrayNode *alloc);
   void expand_allocate_common(AllocateNode* alloc,
@@ -199,7 +196,7 @@ class PhaseMacroExpand : public Phase {
   Node* make_arraycopy_load(ArrayCopyNode* ac, intptr_t offset, Node* ctl, Node* mem, BasicType ft, const Type *ftype, AllocateNode *alloc);
 
 public:
-  PhaseMacroExpand(PhaseIterGVN &igvn) : Phase(Macro_Expand), _igvn(igvn), _has_locks(false) {
+  PhaseMacroExpand(PhaseIterGVN &igvn) : Phase(Macro_Expand), _igvn(igvn) {
     _igvn.set_delay_transform(true);
   }