fix some types for 64-bit platforms

rts/PrimOps.cmm

@@ -1587,7 +1587,7 @@ takeMVarzh_fast
       tso = StgMVar_head(mvar);
       PerformPut(tso,StgMVar_value(mvar));
 
-      if (StgTSO_flags(tso) & TSO_DIRTY == 0) {
+      if (StgTSO_flags(tso) & TSO_DIRTY::I32 == 0) {
           foreign "C" dirty_TSO(MyCapability() "ptr", tso "ptr") [];
       }
 
@@ -1663,7 +1663,7 @@ tryTakeMVarzh_fast
 	/* actually perform the putMVar for the thread that we just woke up */
 	tso = StgMVar_head(mvar);
 	PerformPut(tso,StgMVar_value(mvar));
-        if (StgTSO_flags(tso) & TSO_DIRTY == 0) {
+        if (StgTSO_flags(tso) & TSO_DIRTY::I32 == 0) {
             foreign "C" dirty_TSO(MyCapability() "ptr", tso "ptr") [];
         }
 
@@ -1737,7 +1737,7 @@ putMVarzh_fast
 	/* actually perform the takeMVar */
 	tso = StgMVar_head(mvar);
 	PerformTake(tso, R2);
-        if (StgTSO_flags(tso) & TSO_DIRTY == 0) {
+        if (StgTSO_flags(tso) & TSO_DIRTY::I32 == 0) {
             foreign "C" dirty_TSO(MyCapability() "ptr", tso "ptr") [];
         }
       
@@ -1806,7 +1806,7 @@ tryPutMVarzh_fast
 	/* actually perform the takeMVar */
 	tso = StgMVar_head(mvar);
 	PerformTake(tso, R2);
-        if (StgTSO_flags(tso) & TSO_DIRTY == 0) {
+        if (StgTSO_flags(tso) & TSO_DIRTY::I32 == 0) {
             foreign "C" dirty_TSO(MyCapability() "ptr", tso "ptr") [];
         }