RFR (XS) 8242228: Shenandoah: remove unused ShenandoahCollectionSet methods

[Roman Kennke]

Yes, good! Thanks,
Roman

> RFE:
>   https://bugs.openjdk.java.net/browse/JDK-8242228
> 
> Fix:
> 
> diff -r 5461ecb40ab4 src/hotspot/share/gc/shenandoah/shenandoahCollectionSet.cpp
> --- a/src/hotspot/share/gc/shenandoah/shenandoahCollectionSet.cpp       Mon Apr 06 18:39:02 2020 +0200
> +++ b/src/hotspot/share/gc/shenandoah/shenandoahCollectionSet.cpp       Mon Apr 06 18:44:12 2020 +0200
> @@ -94,21 +94,4 @@
>  }
> 
> -bool ShenandoahCollectionSet::add_region_check_for_duplicates(ShenandoahHeapRegion* r) {
> -  if (!is_in(r)) {
> -    add_region(r);
> -    return true;
> -  } else {
> -    return false;
> -  }
> -}
> -
> -void ShenandoahCollectionSet::remove_region(ShenandoahHeapRegion* r) {
> -  assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "Must be at a safepoint");
> -  assert(Thread::current()->is_VM_thread(), "Must be VMThread");
> -  assert(is_in(r), "Not in collection set");
> -  _cset_map[r->index()] = 0;
> -  _region_count --;
> -}
> -
>  void ShenandoahCollectionSet::clear() {
>    assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "Must be at a safepoint");
> diff -r 5461ecb40ab4 src/hotspot/share/gc/shenandoah/shenandoahCollectionSet.hpp
> --- a/src/hotspot/share/gc/shenandoah/shenandoahCollectionSet.hpp       Mon Apr 06 18:39:02 2020 +0200
> +++ b/src/hotspot/share/gc/shenandoah/shenandoahCollectionSet.hpp       Mon Apr 06 18:44:12 2020 +0200
> @@ -57,8 +57,4 @@
>    // Add region to collection set
>    void add_region(ShenandoahHeapRegion* r);
> -  bool add_region_check_for_duplicates(ShenandoahHeapRegion* r);
> -
> -  // Remove region from collection set
> -  void remove_region(ShenandoahHeapRegion* r);
> 
>    // MT version
> 
> Testing: hotspot_gc_shenandoah
>