XFAIL TestReturnValue for linux i386 clang 3.5-3.6

The test failing most likely because clang 3.5 and 3.6 uses an incorrect
ABI for returning small structs from  a function.

llvm-svn: 254507

lldb/packages/Python/lldbsuite/test/functionalities/return-value/TestReturnValue.py

@@ -17,6 +17,7 @@ class ReturnValueTestCase(TestBase):
     mydir = TestBase.compute_mydir(__file__)
 
     @expectedFailureAll(oslist=["macosx","freebsd"], archs=["i386"])
+    @expectedFailureAll(oslist=["linux"], compiler="clang", compiler_version=["<=", "3.6"], archs=["i386"])
     @expectedFailureWindows("llvm.org/pr24778")
     @add_test_categories(['pyapi'])
     def test_with_python(self):