[lldb] Enable test for getelementptr const args for Windows

The test actually passes fine on Windows, since it doesn't use any
static members.

Follow-up to https://reviews.llvm.org/D113498

Author: werat

lldb/test/API/lang/cpp/static_members/TestCPPStaticMembers.py

@@ -72,8 +72,6 @@ def test_no_crash_in_IR_arithmetic(self):
         value = self.target().EvaluateExpression(expr)
         self.assertSuccess(value.GetError())
 
-    # We fail to lookup static members on Windows.
-    @expectedFailureAll(oslist=["windows"])
     def test_IR_interpreter_can_handle_getelementptr_constants_args(self):
         self.build()
         lldbutil.run_to_source_breakpoint(self, "// stop in main", lldb.SBFileSpec("main.cpp"))