Initialize inflated header marks with current mark

This ensures that we always see these as used. This does result in
inflated header potentially surviving one GC cycle longer, but this is
usually unlikely for objects that get inflated.

vm/objectmemory.cpp

@@ -138,6 +138,7 @@ namespace rubinius {
     InflatedHeader* ih = inflated_headers_->allocate(obj, &ih_header);
     ih->update(state, orig);
     ih->initialize_mutex(state->vm()->thread_id(), count);
+    ih->mark(this, mark_);
 
     while(!obj->set_inflated_header(state, ih_header, orig)) {
       orig = obj->header;
@@ -329,6 +330,7 @@ namespace rubinius {
     }
 
     ih->initialize_mutex(state->vm()->thread_id(), initial_count);
+    ih->mark(this, mark_);
 
     while(!obj->set_inflated_header(state, ih_index, orig)) {
       // The header can't have been inflated by another thread, the
@@ -398,6 +400,8 @@ namespace rubinius {
         return false;
       }
 
+      ih->mark(this, mark_);
+
       // Try it all over again if it fails.
       if(!obj->set_inflated_header(state, ih_header, orig)) {
         ih->clear();
@@ -667,6 +671,7 @@ namespace rubinius {
     InflatedHeader* ih = inflated_headers_->allocate(obj, &ih_index);
     ih->update(state, orig);
     ih->set_object_id(id);
+    ih->mark(this, mark_);
 
     while(!obj->set_inflated_header(state, ih_index, orig)) {
       orig = obj->header;
@@ -696,6 +701,7 @@ namespace rubinius {
     InflatedHeader* ih = inflated_headers_->allocate(obj, &ih_index);
     ih->update(state, orig);
     ih->set_handle(state, handle);
+    ih->mark(this, mark_);
 
     while(!obj->set_inflated_header(state, ih_index, orig)) {
       orig = obj->header;