8308089: [riscv-port-jdk17u] Intrinsify Unsafe.storeStoreFence

Reviewed-by: fyang

Author: zhengxiaolinX

src/hotspot/cpu/riscv/riscv.ad

@@ -7734,6 +7734,7 @@ instruct membar_release() %{
 
 instruct membar_storestore() %{
   match(MemBarStoreStore);
+  match(StoreStoreFence);
   ins_cost(ALU_COST);
 
   format %{ "MEMBAR-store-store\t#@membar_storestore" %}