8330694: Rename 'HeapRegion' to 'G1HeapRegion'

src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/utilities/PointerFinder.java

@@ -123,7 +123,7 @@ public static PointerLocation find(Address a) {
         loc.hr = g1.heapRegionForAddress(a);
         // We don't assert that loc.hr is not null like we do for the SerialHeap. This is
         // because heap.isIn(a) can return true if the address is anywhere in G1's mapped
-        // memory, even if that area of memory is not in use by a G1 G1HeapRegion. So there
+        // memory, even if that area of memory is not in use by a G1HeapRegion. So there
         // may in fact be no G1HeapRegion for the address even though it is in the heap.
         // Leaving loc.hr == null in this case will result in PointerFinder saying that
         // the address is "In unknown section of Java the heap", which is what we want.