Skip 'g' packet tests when running on darwin; debugserver doesn't impl (#2346)

Differential Revision: https://reviews.llvm.org/D94754

(cherry picked from commit 10ac9b2)

Author: jasonmolenda

lldb/test/API/tools/lldb-server/register-reading/TestGdbRemoteGPacket.py

@@ -130,13 +130,15 @@ def g_returns_correct_data(self, with_suffix):
 
     @expectedFailureAll(oslist=["freebsd"], bugnumber="llvm.org/pr48420")
     @expectedFailureNetBSD
+    @skipIfDarwin # g packet not supported
     def test_g_returns_correct_data_with_suffix(self):
         self.build()
         self.set_inferior_startup_launch()
         self.g_returns_correct_data(True)
 
     @expectedFailureAll(oslist=["freebsd"], bugnumber="llvm.org/pr48420")
     @expectedFailureNetBSD
+    @skipIfDarwin # g packet not supported
     def test_g_returns_correct_data_no_suffix(self):
         self.build()
         self.set_inferior_startup_launch()