src/cpu/sparc/vm/sparc.ad

rev 2892 : 7121140: Allocation paths require explicit memory synchronization operations for RMO systems
Summary: adds store store barrier after initialization of header and body of objects.
Reviewed-by:

*** 6771,6780 ****
--- 6771,6790 ----
    format %{ "!MEMBAR-volatile (unnecessary so empty encoding)" %}
    ins_encode( );
    ins_pipe(empty);
  %}
  
+ instruct unnecessary_membar_storestore() %{
+   match(MemBarStoreStore);
+   ins_cost(0);
+ 
+   size(0);
+   format %{ "!MEMBAR-storestore (unnecessary so empty encoding)" %}
+   ins_encode( );
+   ins_pipe(empty);
+ %}
+ 
  //----------Register Move Instructions-----------------------------------------
  instruct roundDouble_nop(regD dst) %{
    match(Set dst (RoundDouble dst));
    ins_cost(0);
    // SPARC results are already "rounded" (i.e., normal-format IEEE)