6822407: heapOopSize lookup is incorrect in Serviceability Agent.

Summary: heapOopSize symbol should be declared as constant in vmStructs and should not be looked up in readVMIntConstants().
Reviewed-by: never, swamyv, coleenp

agent/src/share/classes/sun/jvm/hotspot/HotSpotTypeDataBase.java

@@ -306,8 +306,6 @@ public class HotSpotTypeDataBase extends BasicTypeDataBase {
 
       entryAddr = entryAddr.addOffsetTo(intConstantEntryArrayStride);
     } while (nameAddr != null);
-      String symbol = "heapOopSize"; // global int constant and value is initialized at runtime.
-      addIntConstant(symbol, (int)lookupInProcess(symbol).getCIntegerAt(0, 4, false));
   }
 
   private void readVMLongConstants() {

agent/src/share/classes/sun/jvm/hotspot/runtime/VM.java

@@ -342,12 +342,14 @@ public class VM {
       throw new RuntimeException("Attempt to initialize VM twice");
     }
     soleInstance = new VM(db, debugger, debugger.getMachineDescription().isBigEndian());
-    debugger.putHeapConst(soleInstance.getHeapOopSize(), Universe.getNarrowOopBase(),
-                          Universe.getNarrowOopShift());
+
     for (Iterator iter = vmInitializedObservers.iterator(); iter.hasNext(); ) {
       ((Observer) iter.next()).update(null, null);
     }
 
+    debugger.putHeapConst(soleInstance.getHeapOopSize(), Universe.getNarrowOopBase(),
+                          Universe.getNarrowOopShift());
+
   }
 
   /** This is used by the debugging system */

src/share/vm/runtime/vmStructs.cpp

@@ -1320,6 +1320,7 @@ static inline uint64_t cast_uint64_t(size_t x)
   /****************/                                                      \
                                                                           \
   declare_constant(oopSize)                                               \
+  declare_constant(heapOopSize)                                           \
   declare_constant(LogBytesPerWord)                                       \
   declare_constant(BytesPerLong)                                          \
                                                                           \