Compile more stdlib files with -O3 (ocaml-flambda#380)

ocaml/stdlib/camlinternalAtomic.ml

@@ -13,6 +13,8 @@
 (*                                                                        *)
 (**************************************************************************)
 
+[@@@ocaml.flambda_o3]
+
 (* CamlinternalAtomic is a dependency of Stdlib, so it is compiled with
    -nopervasives. *)
 external ( == ) : 'a -> 'a -> bool = "%eq"

ocaml/stdlib/either.ml

@@ -13,6 +13,8 @@
 (*                                                                        *)
 (**************************************************************************)
 
+[@@@ocaml.flambda_o3]
+
 type ('a, 'b) t = Left of 'a | Right of 'b
 
 let left v = Left v

ocaml/stdlib/stdlib.ml

@@ -15,6 +15,7 @@
 (**************************************************************************)
 
 [@@@ocaml.warning "-49"]
+[@@@ocaml.flambda_o3]
 
 (* Exceptions *)
 

ocaml/testsuite/tests/backtrace/pr2195-locs.byte.reference

@@ -1,4 +1,4 @@
 Fatal error: exception Stdlib.Exit
-Raised by primitive operation at Stdlib.open_in_gen in file "stdlib.ml", line 401, characters 28-54
+Raised by primitive operation at Stdlib.open_in_gen in file "stdlib.ml", line 402, characters 28-54
 Called from Pr2195 in file "pr2195.ml", line 24, characters 6-19
 Re-raised at Pr2195 in file "pr2195.ml", line 29, characters 4-41

ocaml/testsuite/tests/backtrace/pr2195.opt.reference

@@ -1,5 +1,5 @@
 Fatal error: exception Stdlib.Exit
-Raised by primitive operation at Stdlib.open_in_gen in file "stdlib.ml", line 401, characters 28-54
-Called from Stdlib.open_in in file "stdlib.ml" (inlined), line 406, characters 2-45
+Raised by primitive operation at Stdlib.open_in_gen in file "stdlib.ml", line 402, characters 28-54
+Called from Stdlib.open_in in file "stdlib.ml" (inlined), line 407, characters 2-45
 Called from Pr2195 in file "pr2195.ml", line 24, characters 6-19
 Re-raised at Pr2195 in file "pr2195.ml", line 29, characters 4-41

ocaml/testsuite/tests/lib-dynlink-initializers/test10_main.byte.reference

@@ -1,5 +1,5 @@
 Error: Failure("Plugin error")
-Raised at Stdlib.failwith in file "stdlib.ml", line 31, characters 17-33
+Raised at Stdlib.failwith in file "stdlib.ml", line 32, characters 17-33
 Called from Test10_plugin.g in file "test10_plugin.ml", line 3, characters 2-21
 Called from Test10_plugin.f in file "test10_plugin.ml", line 6, characters 2-6
 Called from Test10_plugin in file "test10_plugin.ml", line 10, characters 2-6

ocaml/testsuite/tests/lib-dynlink-initializers/test10_main.native.reference

@@ -1,5 +1,5 @@
 Error: Failure("Plugin error")
-Raised at Stdlib.failwith in file "stdlib.ml", line 31, characters 17-33
+Raised at Stdlib.failwith in file "stdlib.ml", line 32, characters 17-33
 Called from Test10_plugin.g in file "test10_plugin.ml", line 2, characters 15-38
 Called from Test10_plugin in file "test10_plugin.ml", line 10, characters 2-6
 Called from Dynlink.Native.run.(fun) in file "otherlibs/dynlink/dynlink.ml", line 250, characters 12-29