6863216: Clean up debugging debris inadvertently pushed with 6700789

Summary: Anti-delta for debugging debris that was inadvertently pushed.
Reviewed-by: kvn, tonyp

src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp

@@ -1655,9 +1655,8 @@ void G1CollectedHeap::iterate_dirty_card_closure(bool concurrent,
 // Computes the sum of the storage used by the various regions.
 
 size_t G1CollectedHeap::used() const {
-  // Temporarily, until 6859911 is fixed. XXX
-  // assert(Heap_lock->owner() != NULL,
-  //        "Should be owned on this thread's behalf.");
+  assert(Heap_lock->owner() != NULL,
+         "Should be owned on this thread's behalf.");
   size_t result = _summary_bytes_used;
   // Read only once in case it is set to NULL concurrently
   HeapRegion* hr = _cur_alloc_region;

src/share/vm/opto/cfgnode.cpp

@@ -1789,7 +1789,7 @@ Node *PhiNode::Ideal(PhaseGVN *phase, bool can_reshape) {
 #ifdef _LP64
   // Push DecodeN down through phi.
   // The rest of phi graph will transform by split EncodeP node though phis up.
-  if (UseNewCode && UseCompressedOops && can_reshape && progress == NULL) {
+  if (UseCompressedOops && can_reshape && progress == NULL) {
     bool may_push = true;
     bool has_decodeN = false;
     Node* in_decodeN = NULL;