[lldb] [test] Skip AVX lldb-server test on non-x86 architectures

[mgorny]

Summary

Skip the AVX-related lldb-server test on non-x86 architectures, as they
do not support AVX. While technically the test worked on Linux because
the AVX check would simply return false, other platforms do not provide
such a straightforward way of checking for AVX (especially remotely),
and the results of such check may need to be interpreted specially
for the platform in question.

lldb/test/API/tools/lldb-server/TestLldbGdbServer.py

def targetHasAVX(self):
             cpuinfo_path = "/proc/cpuinfo"
 
         f = open(cpuinfo_path, 'r')
         cpuinfo = f.read()
         f.close()
         return " avx " in cpuinfo
 
     @expectedFailureAll(oslist=["windows"]) # no avx for now.
+    @skipIf(archs=no_match(['amd64', 'i386', 'x86_64']))
     @add_test_categories(["llgs"])
     def test_qRegisterInfo_contains_avx_registers(self):
         self.build()
         self.prep_debug_monitor_and_inferior()
         self.add_register_info_collection_packets()
 
         # Run the packet stream.
         context = self.expect_gdbremote_sequence()