PR ld/21529: Use a linker script to limit output with the test case

Complement commit d9409498813c ("Add a testcase for PR ld/21529") and
use a linker script to prevent an inter-segment gap arranged by the
default linker script associated with some targets such as `rx-elf':

$ ld -e main -o tmpdir/dump-elf tmpdir/pr21529.o
$ readelf -l tmpdir/dump-elf
Elf file type is EXEC (Executable file)
Entry point 0x10000004
There are 2 program headers, starting at offset 52

Program Headers:
  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
  LOAD           0x001000 0x10000000 0x10000000 0x00008 0x00008 R E 0x1000
  LOAD           0x001ffc 0xbffffffc 0xbffffffc 0x00004 0x00004 RW  0x1000

 Section to Segment mapping:
  Segment Sections...
   00     .text
   01     .stack
$

and converted to padding with the use of the binary BFD for output from
producing unreasonably large files.

	ld/
	* testsuite/ld-unique/pr21529.ld: New test linker script.
	* testsuite/ld-unique/pr21529.d: Use it.

2 files changed, 6 insertions, 1 deletions

diff --git a/ld/testsuite/ld-unique/pr21529.d b/ld/testsuite/ld-unique/pr21529.d
index 1bcd4fe..bc4763d 100644
--- a/ld/testsuite/ld-unique/pr21529.d
+++ b/ld/testsuite/ld-unique/pr21529.d
@@ -1,4 +1,4 @@
-#ld: --oformat binary -e main
+#ld: --oformat binary -T pr21529.ld -e main
 #objdump: -s -b binary
 #xfail: aarch64*-*-* arm*-*-* hppa-*-* ia64-*-* nds32*-*-* score-*-*
 
diff --git a/ld/testsuite/ld-unique/pr21529.ld b/ld/testsuite/ld-unique/pr21529.ld
new file mode 100644
index 0000000..113e70b
--- /dev/null
+++ b/ld/testsuite/ld-unique/pr21529.ld
@@ -0,0 +1,5 @@
+SECTIONS
+{
+  .text : { *(.text) }
+  /DISCARD/ : { *(*) }
+}