[COMMITTED] Tweak to patch for PR55492

[Richard Henderson]

Yvan noticed that the set of memory models has already been
validated by expand_builtin_atomic_store, so the test here
in expand_atomic_store is fully redundant.

Committed.


r~

        * optabs.c (expand_atomic_store): Elide redundant model test.


diff --git a/gcc/optabs.c b/gcc/optabs.c
index 99fd025..4f3cbb4 100644
--- a/gcc/optabs.c
+++ b/gcc/optabs.c
@@ -7537,8 +7537,7 @@ expand_atomic_store (rtx mem, rtx val, enum memmodel 
model, bool use_release)
     }
 
   /* Otherwise assume stores are atomic, and emit the proper barriers.  */
-  if (model == MEMMODEL_SEQ_CST || model == MEMMODEL_RELEASE)
-    expand_mem_thread_fence (model);
+  expand_mem_thread_fence (model);
 
   emit_move_insn (mem, val);