6420645: Create a vm that uses compressed oops for up to 32gb heapsizes

Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv

Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold

hotspot/src/share/vm/memory/restore.cpp

@@ -50,6 +50,8 @@ public:
     *p = obj;
   }
 
+  void do_oop(narrowOop* p) { ShouldNotReachHere(); }
+
   void do_ptr(void** p) {
     assert(*p == NULL, "initializing previous initialized pointer.");
     void* obj = nextOop();