gas: move obj_begin earlier

[Alan Modra]

csky wants to set up ELF object attributes in its md_begin.

I've had a look over all the md_begin functions and elf_begin and
it looks safe to run elf_being earlier.  gas_cgen_begin must run
after md_begin.

	* as.c (perform_an_assembly_pass): Move obj_begin earlier.
	* testsuite/gas/mmix/builtin1.d,
	* testsuite/gas/mmix/builtin3.d: Adjust expected output.

diff --git a/gas/as.c b/gas/as.c
index 6492bf1351f..f08c7c71d73 100644
--- a/gas/as.c
+++ b/gas/as.c
@@ -1266,16 +1266,16 @@ perform_an_assembly_pass (int argc, char ** argv)
   if (strstr (BFD_VERSION_STRING, "." XSTRING (BFD_VERSION_DATE)) != NULL)
     predefine_symbol ("date", BFD_VERSION_DATE);
 
+#ifdef obj_begin
+  obj_begin ();
+#endif
+
   /* This may add symbol table entries, which requires having an open BFD,
      and sections already created.  */
   md_begin ();
-
 #ifdef USING_CGEN
   gas_cgen_begin ();
 #endif
-#ifdef obj_begin
-  obj_begin ();
-#endif
 
   /* Skip argv[0].  */
   argv++;
diff --git a/gas/testsuite/gas/mmix/builtin1.d b/gas/testsuite/gas/mmix/builtin1.d
index 17d13bbfa68..c03a287a401 100644
--- a/gas/testsuite/gas/mmix/builtin1.d
+++ b/gas/testsuite/gas/mmix/builtin1.d
@@ -6,10 +6,10 @@
 .*:     file format elf64-mmix
 
 SYMBOL TABLE:
-0+14 l       \*ABS\*	0+ rJ
 0+ l    d  \.text	0+ (|\.text)
 0+ l    d  \.data	0+ (|\.data)
 0+ l    d  \.bss	0+ (|\.bss)
+0+14 l       \*ABS\*	0+ rJ
 0+ g     F \.text	0+ Main
 
 
diff --git a/gas/testsuite/gas/mmix/builtin3.d b/gas/testsuite/gas/mmix/builtin3.d
index 74801a6d548..29455374db6 100644
--- a/gas/testsuite/gas/mmix/builtin3.d
+++ b/gas/testsuite/gas/mmix/builtin3.d
@@ -8,10 +8,10 @@
 .*:     file format elf64-mmix
 
 SYMBOL TABLE:
-0+14 l       \*ABS\*	0+ rJ
 0+ l    d  \.text	0+ (|\.text)
 0+ l    d  \.data	0+ (|\.data)
 0+ l    d  \.bss	0+ (|\.bss)
+0+14 l       \*ABS\*	0+ rJ
 0+ g     F \.text	0+ Main
 
 

-- 
Alan Modra