s12z and h8300 no-print-map-discarded fails

This tidies the remaining --no-print-map-discarded fails.  h8300-elf
warns on a section without flags, and s12z doesn't support
--gc-sections.

bfd/
	* elf32-s12z.c (elf_backend_can_gc_sections): Don't define
ld/
	* testsuite/ld-gc/skip-map-discarded.s: Add section attributes.
	* testsuite/lib/ld-lib.exp (check_gc_sections_available): Add
	s12z to list of targets not supporting --gc-sections.

bfd/ChangeLog

@@ -1,3 +1,7 @@
+2019-04-19  Alan Modra  <amodra@gmail.com>
+
+	* elf32-s12z.c (elf_backend_can_gc_sections): Don't define
+
 2019-04-17  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* elf64-x86-64.c (elf_x86_64_need_pic): Suggest -fPIE when not

bfd/elf32-s12z.c

@@ -318,6 +318,5 @@ s12z_elf_set_mach_from_flags (bfd *abfd)
 #define elf_info_to_howto_rel			s12z_info_to_howto_rel
 #define elf_backend_object_p			s12z_elf_set_mach_from_flags
 #define elf_backend_final_write_processing	NULL
-#define elf_backend_can_gc_sections		1
 
 #include "elf32-target.h"

ld/ChangeLog

@@ -1,3 +1,9 @@
+2019-04-19  Alan Modra  <amodra@gmail.com>
+
+	* testsuite/ld-gc/skip-map-discarded.s: Add section attributes.
+	* testsuite/lib/ld-lib.exp (check_gc_sections_available): Add
+	s12z to list of targets not supporting --gc-sections.
+
 2019-04-17  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* testsuite/ld-i386/i386.exp: Run pr18801a and pr18801b instead

ld/testsuite/ld-gc/skip-map-discarded.s

@@ -1,5 +1,6 @@
-.globl __start
+	.globl	__start
 __start:
-	.section	_foo
+
+	.section _foo,"ax",%progbits
 foo:
 	.long	1

ld/testsuite/lib/ld-lib.exp

@@ -1043,6 +1043,7 @@ proc check_gc_sections_available { } {
 	    || [istarget mn10200-*-*]
 	    || [istarget pj*-*-*]
 	    || [istarget pru*-*-*]
+	    || [istarget s12z-*-*]
 	    || [istarget xgate-*-*] } {
 	    set gc_sections_available_saved 0
 	    return 0