[Bug target/104189] enable 64-bit compare-and-swap on SPARC/Linux with V9

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104189

--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I suppose we can do this then:

--- a/libstdc++-v3/testsuite/lib/dg-options.exp
+++ b/libstdc++-v3/testsuite/lib/dg-options.exp
@@ -296,7 +296,6 @@ proc add_options_for_libatomic { flags } {
     if { [istarget hppa*-*-hpux*]
         || ([istarget powerpc*-*-*] && [check_effective_target_ilp32])
         || [istarget riscv*-*-*]
-        || ([istarget sparc*-*-linux-gnu] && [check_effective_target_ilp32])
        } {
        global TOOL_OPTIONS