Fix compiler errors

Author: caizixian

openjdk/mmtkHeap.cpp

@@ -110,7 +110,7 @@ jint MMTkHeap::initialize() {
   //_start = (HeapWord*)heap_rs.base();
   //_end = (HeapWord*)(heap_rs.base() + heap_rs.size());
 
-  ReservedHeapSpace heap_rs = Universe::reserve_heap(mmtk_heap_size, HeapAlignment);
+  ReservedHeapSpace heap_rs = Universe::reserve_heap(heap_size, HeapAlignment);
   //  printf("start: %p, end: %p\n", _start, _end);
 
   initialize_reserved_region(heap_rs);

openjdk/mmtkHeap.hpp

@@ -186,10 +186,6 @@ class MMTkHeap : public CollectedHeap {
   // An object is scavengable if its location may move during a scavenge.
   // (A scavenge is a GC which is not a full GC.)
   inline bool is_scavengable(oop obj) { return true; }
-  // Registering and unregistering an nmethod (compiled code) with the heap.
-  // Override with specific mechanism for each specialized heap type.
-  virtual void register_nmethod(nmethod* nm);
-  virtual void unregister_nmethod(nmethod* nm);
 
   // Heap verification
   void verify(VerifyOption option);