prepare to remove export_idents from meta type definition (+2 squashed commits)

Squashed commits:
[08b6c47] prepare to add a global variable for current export idents
[3da1913] add ordered_hash_set replace support

Author: bobzhang

jscomp/Makefile

@@ -75,6 +75,9 @@ ext/ordered_hash_set_make.ml : ext/ordered_hash_set.cppo.ml
 ext/ordered_hash_set_string.ml:ext/ordered_hash_set.cppo.ml
 	cppo -D TYPE_STRING $< -o $@
 
+ext/ordered_hash_set_ident.ml:ext/ordered_hash_set.cppo.ml
+	cppo -D TYPE_IDENT $< -o $@
+
 ext/string_hashtbl.ml: ext/hashtbl.cppo.ml
 	cppo -D TYPE_STRING $< -o $@	
 ext/int_hashtbl.ml: ext/hashtbl.cppo.ml
@@ -153,12 +156,13 @@ EXT_SRCS = ext_util\
 	ext_marshal ext_option \
 	ext_pervasives ext_pp ext_ref  ext_sys \
 	hash_set_gen hash_set string_hash_set int_hash_set \
+	ext_ident\
 	ordered_hash_set_gen\
 	ordered_hash_set_string\
+	ordered_hash_set_ident\
 	ordered_hash_set_make\
 	ordered_hash_map_gen\
 	union_find \
-	ext_ident\
 	ident_map\
 	ident_set\
 	hashtbl_make\

jscomp/all.depend

@@ -33,15 +33,19 @@ ext/string_hash_set.cmx : ext/hash_set_gen.cmx ext/ext_string.cmx \
     stubs/bs_hash_stubs.cmx ext/string_hash_set.cmi
 ext/int_hash_set.cmx : ext/hash_set_gen.cmx ext/ext_int.cmx \
     stubs/bs_hash_stubs.cmx ext/int_hash_set.cmi
+ext/ext_ident.cmx : ext/string_hashtbl.cmx ext/string_hash_set.cmx \
+    ext/ext_string.cmx ext/ext_ident.cmi
 ext/ordered_hash_set_gen.cmx : ext/ext_util.cmx
 ext/ordered_hash_set_string.cmx : ext/ordered_hash_set_gen.cmx \
-    ext/ext_string.cmx stubs/bs_hash_stubs.cmx \
+    ext/ext_util.cmx ext/ext_string.cmx stubs/bs_hash_stubs.cmx \
     ext/ordered_hash_set_string.cmi
-ext/ordered_hash_set_make.cmx : ext/ordered_hash_set_gen.cmx
+ext/ordered_hash_set_ident.cmx : ext/ordered_hash_set_gen.cmx \
+    ext/ext_util.cmx ext/ext_ident.cmx stubs/bs_hash_stubs.cmx \
+    ext/ordered_hash_set_ident.cmi
+ext/ordered_hash_set_make.cmx : ext/ordered_hash_set_gen.cmx \
+    ext/ext_util.cmx
 ext/ordered_hash_map_gen.cmx : ext/ext_util.cmx
 ext/union_find.cmx : ext/union_find.cmi
-ext/ext_ident.cmx : ext/string_hashtbl.cmx ext/string_hash_set.cmx \
-    ext/ext_string.cmx ext/ext_ident.cmi
 ext/ident_map.cmx : ext/map_gen.cmx ext/ext_ident.cmx ext/ident_map.cmi
 ext/ident_set.cmx : ext/set_gen.cmx ext/ident_set.cmi
 ext/hashtbl_make.cmx : ext/hashtbl_gen.cmx ext/hashtbl_make.cmi
@@ -92,9 +96,10 @@ ext/ext_sys.cmi :
 ext/hash_set.cmi : ext/hash_set_gen.cmx
 ext/string_hash_set.cmi : ext/hash_set_gen.cmx
 ext/int_hash_set.cmi : ext/hash_set_gen.cmx
+ext/ext_ident.cmi :
 ext/ordered_hash_set_string.cmi : ext/ordered_hash_set_gen.cmx
+ext/ordered_hash_set_ident.cmi : ext/ordered_hash_set_gen.cmx
 ext/union_find.cmi :
-ext/ext_ident.cmi :
 ext/ident_map.cmi : ext/map_gen.cmx
 ext/ident_set.cmi : ext/set_gen.cmx
 ext/hashtbl_make.cmi : ext/hashtbl_gen.cmx
@@ -302,7 +307,8 @@ core/ocaml_parse.cmx : syntax/ppx_entry.cmx common/js_config.cmx \
 core/lam.cmx : ext/ordered_hash_map_local_ident.cmx \
     core/ocaml_stdlib_slots.cmx ext/literals.cmx common/js_config.cmx \
     ext/int_vec_vec.cmx ext/int_vec.cmx ext/ident_set.cmx \
-    ext/ident_hash_set.cmx ext/ext_string.cmx ext/ext_scc.cmx core/lam.cmi
+    ext/ident_hashtbl.cmx ext/ident_hash_set.cmx ext/ext_string.cmx \
+    ext/ext_scc.cmx core/lam.cmi
 core/lam_print.cmx : core/lam.cmx core/lam_print.cmi
 core/lam_beta_reduce_util.cmx : core/lam.cmx ext/ident_hashtbl.cmx \
     core/lam_beta_reduce_util.cmi