[lldb][test] Disable TestSharedLibStrippedSymbols on Arm

This has been flakey lately for example:
https://lab.llvm.org/buildbot/#/builders/18/builds/5139

Author: DavidSpickett

lldb/test/API/lang/c/shared_lib_stripped_symbols/TestSharedLibStrippedSymbols.py

@@ -10,6 +10,10 @@
 
 class SharedLibStrippedTestCase(TestBase):
     @expectedFailureAll(oslist=["windows"])
+    # Sometimes fails with:
+    # error: Couldn't allocate space for materialized struct: Couldn't malloc: address space is full
+    # On 32 bit Arm Linux.
+    @skipIf(archs=["arm"])
     def test_expr(self):
         """Test that types work when defined in a shared library and forward-declared in the main executable"""
         if "clang" in self.getCompiler() and "3.4" in self.getCompilerVersion():