[LLD][ELF] Ensure tests use -o /dev/null instead of attempting to write to the bin directory. [NFC]

This error was introduced in r353508.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@353602 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/ELF/archive-thin-missing-member.s b/test/ELF/archive-thin-missing-member.s
index 6ade1fc..d96fbc4 100644
--- a/test/ELF/archive-thin-missing-member.s
+++ b/test/ELF/archive-thin-missing-member.s
@@ -8,15 +8,15 @@
 # RUN: rm %t.o
 
 # Test error when loading symbols from missing thin archive member.
-# RUN: not ld.lld %t-no-syms.a 2>&1 | FileCheck %s --check-prefix=ERR1
+# RUN: not ld.lld %t-no-syms.a -o /dev/null 2>&1 | FileCheck %s --check-prefix=ERR1
 # ERR1: {{.*}}-no-syms.a: could not get the buffer for a child of the archive: '{{.*}}.o': {{[Nn]}}o such file or directory
 
 # Test error when thin archive has symbol table but member is missing.
-# RUN: not ld.lld -m elf_amd64_fbsd %t-syms.a 2>&1 | FileCheck %s --check-prefix=ERR2
+# RUN: not ld.lld -m elf_amd64_fbsd %t-syms.a -o /dev/null 2>&1 | FileCheck %s --check-prefix=ERR2
 # ERR2: {{.*}}-syms.a: could not get the buffer for the member defining symbol _start: '{{.*}}.o': {{[Nn]}}o such file or directory
 
 # Test error when thin archive is linked using --whole-archive but member is missing.
-# RUN: not ld.lld --whole-archive %t-syms.a 2>&1 | FileCheck %s --check-prefix=ERR3
+# RUN: not ld.lld --whole-archive %t-syms.a -o /dev/null 2>&1 | FileCheck %s --check-prefix=ERR3
 # ERR3: {{.*}}-syms.a: could not get the buffer for a child of the archive: '{{.*}}.o': {{[Nn]}}o such file or directory
 
 .global _start