ld-aarch64: check support before launching dt_relr tests

Not all aarch64 targets supports dt_relr as this requires some
mechanisms on the OS side.

Adjust support_dt_relr helper and use it in aarch64-elf.exp.

binutils/testsuite/lib/binutils-common.exp

diff --git a/binutils/testsuite/lib/binutils-common.exp b/binutils/testsuite/lib/binutils-common.exp
index 2fca43b..bf291d7 100644
--- a/binutils/testsuite/lib/binutils-common.exp
+++ b/binutils/testsuite/lib/binutils-common.exp
@@ -472,7 +472,8 @@
 proc supports_dt_relr {} {
     if { ([istarget x86_64-*-*]
 	  || [istarget i?86-*-*]
-	  || [istarget powerpc64*-*-*])
+	  || [istarget powerpc64*-*-*]
+	  || [istarget aarch64*-*-*])
 	 && ([istarget *-*-linux*]
 	     || [istarget *-*-gnu*]) } {
 	return 1

ld/testsuite/ld-aarch64/aarch64-elf.exp

diff --git a/ld/testsuite/ld-aarch64/aarch64-elf.exp b/ld/testsuite/ld-aarch64/aarch64-elf.exp
index 0e70ca3..dc5eed5 100644
--- a/ld/testsuite/ld-aarch64/aarch64-elf.exp
+++ b/ld/testsuite/ld-aarch64/aarch64-elf.exp
@@ -468,15 +468,17 @@
 run_dump_test_lp64 "bti-far-opt"
 run_dump_test_lp64 "bti-far-3"
 
-run_dump_test_lp64 "relr-align"
-run_dump_test_lp64 "relr-data-pie"
-run_dump_test_lp64 "relr-data-shared"
-run_dump_test_lp64 "relr-got-pie"
-run_dump_test_lp64 "relr-got-shared"
-run_dump_test_lp64 "relr-text-pie"
-run_dump_test_lp64 "relr-text-shared"
-run_dump_test_lp64 "relr-discard-pie"
-run_dump_test_lp64 "relr-discard-shared"
+if { [supports_dt_relr] } {
+  run_dump_test_lp64 "relr-align"
+  run_dump_test_lp64 "relr-data-pie"
+  run_dump_test_lp64 "relr-data-shared"
+  run_dump_test_lp64 "relr-got-pie"
+  run_dump_test_lp64 "relr-got-shared"
+  run_dump_test_lp64 "relr-text-pie"
+  run_dump_test_lp64 "relr-text-shared"
+  run_dump_test_lp64 "relr-discard-pie"
+  run_dump_test_lp64 "relr-discard-shared"
+}
 
 if { ![skip_sframe_tests] } {
   run_dump_test "sframe-simple-1"