[TestLibCxxAtomic] Skip for GCC.

Summary: This is the form on other libc++ tests.

Reviewers: sivachandra

Subscribers: lldb-commits

Differential Revision: http://reviews.llvm.org/D17230

llvm-svn: 260793

lldb/packages/Python/lldbsuite/test/functionalities/data-formatter/data-formatter-stl/libcxx/atomic/TestLibCxxAtomic.py

@@ -22,6 +22,7 @@ class LibCxxAtomicTestCase(TestBase):
         var.SetPreferSyntheticValue(True)
         return var
 
+    @skipIf(compiler="gcc")
     @skipIfWindows # libc++ not ported to Windows yet
     def test(self):
         """Test that std::atomic as defined by libc++ is correctly printed by LLDB"""