add check for aarch64 in check_effective_target_section_anchors()

[Prathamesh Kulkarni]

Hi,
aarch64 supports section anchors but it appears
check_effective_target_section_anchors() doesn't contain entry for it.
This patch adds for entry for aarch64.
OK for trunk ?

Thanks,
Prathamesh

diff --git a/gcc/testsuite/lib/target-supports.exp 
b/gcc/testsuite/lib/target-supports.exp
index 645981a..66fb1ea 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -5467,7 +5467,8 @@ proc check_effective_target_section_anchors { } {
     } else {
         set et_section_anchors_saved 0
         if { [istarget powerpc*-*-*]
-             || [istarget arm*-*-*] } {
+             || [istarget arm*-*-*] 
+             || [istarget aarch64*-*-*] } {
            set et_section_anchors_saved 1
         }
     }

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