Adapt lit-test codegen/gh1955.d to changed critical section mangling

The critical section is lowered to a `static shared` global now;
previously, it was `[static] __gshared`.

tests/codegen/gh1955.d

@@ -13,7 +13,7 @@ void main()
     /* The synchronized-block uses a global buffer for the D_CRITICAL_SECTION.
      * Match its size and alignment.
      */
-    // CHECK: __critsec{{[0-9Gg]+\"?}} = global {{\[}}[[SIZEOF:[0-9]+]] x i8{{\]}} zeroinitializer
+    // CHECK: __critsec{{.*}} = global {{\[}}[[SIZEOF:[0-9]+]] x i8{{\]}} zeroinitializer
     // CHECK-SAME: align [[ALIGNOF:[0-9]+]]
     synchronized {}