8272196: Remove unused class ParStrongRootsScope

Reviewed-by: tschatzl, pliden

Author: albertnetymk

src/hotspot/share/gc/parallel/parallelScavengeHeap.cpp

@@ -784,14 +784,6 @@ void ParallelScavengeHeap::resize_old_gen(size_t desired_free_space) {
   _old_gen->resize(desired_free_space);
 }
 
-ParallelScavengeHeap::ParStrongRootsScope::ParStrongRootsScope() {
-  // nothing particular
-}
-
-ParallelScavengeHeap::ParStrongRootsScope::~ParStrongRootsScope() {
-  // nothing particular
-}
-
 #ifndef PRODUCT
 void ParallelScavengeHeap::record_gen_tops_before_GC() {
   if (ZapUnusedHeapArea) {

src/hotspot/share/gc/parallel/parallelScavengeHeap.hpp

@@ -247,13 +247,6 @@ class ParallelScavengeHeap : public CollectedHeap {
   // Mangle the unused parts of all spaces in the heap
   void gen_mangle_unused_area() PRODUCT_RETURN;
 
-  // Call these in sequential code around the processing of strong roots.
-  class ParStrongRootsScope : public MarkScope {
-   public:
-    ParStrongRootsScope();
-    ~ParStrongRootsScope();
-  };
-
   GCMemoryManager* old_gc_manager() const { return _old_manager; }
   GCMemoryManager* young_gc_manager() const { return _young_manager; }