Convert ssamoswap load traps to store traps

The difference can manifest when checking triggers.

riscv/mmu.h

@@ -196,10 +196,12 @@ public:
   // for shadow stack amoswap
   template<typename T>
   T ssamoswap(reg_t addr, reg_t value) {
+    convert_load_traps_to_store_traps({
       store_slow_path(addr, sizeof(T), nullptr, {.ss_access=true}, false, true);
       auto data = load<T>(addr, {.ss_access=true});
       store<T>(addr, value, {.ss_access=true});
       return data;
+    })
   }
 
   template<typename T>