[committed] MIPS/LD/testsuite: Fix IRIX dumps for n64 GOT relocation tests

[Maciej W. Rozycki]

Factor in the presence of a `.gnu.attributes' section at the end of the 
respective dumps:

Disassembly of section .gnu.attributes:

0000000000000000 <.gnu.attributes>:
   0:	41000000 	bc0f	4 <__dso_displacement+0x4>
   4:	0f676e75 	jal	d9db9d4 <__dso_displacement+0xd9db9d4>
   8:	00010000 	sll	zero,at,0x0
   c:	00070401 	0x70401

and also ignore any trailing output with the IRIX variant of n64 GOT
relocation tests, like already done with the Linux and the embedded 
ones, removing:

FAIL: MIPS ELF got reloc n64
FAIL: MIPS ELF xgot reloc n64

LD testsuite regressions with the `mips-sgi-irix6' target.

	ld/
	* testsuite/ld-mips-elf/elf-rel-got-n64.d: Add `#pass' at the 
	end.
	* testsuite/ld-mips-elf/elf-rel-xgot-n64.d: Likewise.
---
 ld/testsuite/ld-mips-elf/elf-rel-got-n64.d  |    1 +
 ld/testsuite/ld-mips-elf/elf-rel-xgot-n64.d |    1 +
 2 files changed, 2 insertions(+)

binutils-ld-mips-test-irix-reloc-n64.diff
Index: binutils/ld/testsuite/ld-mips-elf/elf-rel-got-n64.d
===================================================================
--- binutils.orig/ld/testsuite/ld-mips-elf/elf-rel-got-n64.d	2018-07-08 22:47:10.000000000 +0100
+++ binutils/ld/testsuite/ld-mips-elf/elf-rel-got-n64.d	2018-07-08 22:52:32.317349250 +0100
@@ -323,3 +323,4 @@
     10010684:	10000514 	.*
     10010688:	00000000 	.*
 	\.\.\.
+#pass
Index: binutils/ld/testsuite/ld-mips-elf/elf-rel-xgot-n64.d
===================================================================
--- binutils.orig/ld/testsuite/ld-mips-elf/elf-rel-xgot-n64.d	2018-07-08 22:47:10.000000000 +0100
+++ binutils/ld/testsuite/ld-mips-elf/elf-rel-xgot-n64.d	2018-07-08 22:55:51.586873892 +0100
@@ -437,3 +437,4 @@
     1001085c:	10000110 	.*
     10010860:	00000000 	.*
     10010864:	1001075c 	.*
+#pass