flambda-backend: Bump magic numbers for minus-4 (and update script) (#2159)

* update magic numbers script

* bump magic numbers for minus-4

Author: ccasin

boot/ocamlc

@@ -60,7 +60,7 @@ struct exec_trailer {
 
 /* Magic number for this release */
 
-#define EXEC_MAGIC "Caml1999X520"
+#define EXEC_MAGIC "Caml1999X521"
 
 #endif /* CAML_INTERNALS */
 

boot/ocamllex

@@ -60,7 +60,7 @@ struct exec_trailer {
 
 /* Magic number for this release */
 
-#define EXEC_MAGIC "Caml1999X520"
+#define EXEC_MAGIC "Caml1999X521"
 
 #endif /* CAML_INTERNALS */
 

runtime/caml/exec.h

@@ -31,28 +31,28 @@ let standard_library =
 (* When artifacts are incompatible with upstream OCaml, ocaml-jst uses
    magic numbers ending in 5xx. (The AST remains
    compatible, so use upstream numbers) *)
-let exec_magic_number = "Caml1999X520"
+let exec_magic_number = "Caml1999X521"
     (* exec_magic_number is duplicated in runtime/caml/exec.h *)
-and cmi_magic_number = "Caml1999I520"
-and cmo_magic_number = "Caml1999O520"
-and cma_magic_number = "Caml1999A520"
+and cmi_magic_number = "Caml1999I521"
+and cmo_magic_number = "Caml1999O521"
+and cma_magic_number = "Caml1999A521"
 and cmx_magic_number =
   if flambda || flambda2 then
-    "Caml2021y520"
+    "Caml2021y521"
   else
-    "Caml2021Y520"
+    "Caml2021Y521"
 and cmxa_magic_number =
   if flambda || flambda2 then
-    "Caml2021z520"
+    "Caml2021z521"
   else
-    "Caml2021Z520"
+    "Caml2021Z521"
 and ast_impl_magic_number = "Caml1999M033"
 and ast_intf_magic_number = "Caml1999N033"
-and cmxs_magic_number = "Caml1999D520"
-and cmt_magic_number = "Caml1999T520"
-and cms_magic_number = "Caml1999S520"
-and linear_magic_number = "Caml1999L520"
-and cfg_magic_number = "Caml2021G520"
+and cmxs_magic_number = "Caml1999D521"
+and cmt_magic_number = "Caml1999T521"
+and cms_magic_number = "Caml1999S521"
+and linear_magic_number = "Caml1999L521"
+and cfg_magic_number = "Caml2021G521"
 
 let safe_string = true
 let default_safe_string = true