fixup! [op.c] Break fragile long-distance dependency on keyword list order

Author: Branislav Zahradník

op.c

@@ -16174,9 +16174,9 @@ Perl_coresub_op(pTHX_ SV * const coreargssv, const int code,
     case 0: {
         int caller_index = -1;
         switch (-code) {
-            case (KEY___PACKAGE__): { caller_index = 0; break; } /* (caller)[0] */
-            case (KEY___FILE__):    { caller_index = 1; break; } /* (caller)[1] */
-            case (KEY___LINE__):    { caller_index = 2; break; } /* (caller)[2] */
+            case KEY___PACKAGE__: caller_index = 0; break; /* (caller)[0] */
+            case KEY___FILE__:    caller_index = 1; break; /* (caller)[1] */
+            case KEY___LINE__:    caller_index = 2; break; /* (caller)[2] */
         }
 
         return op_append_elem(OP_LINESEQ,