Fix TestUbsanBasic

[friss]

Summary

Potentially due to the recent testuite refactorings, this test now reports
a full absolute path but expect just the filename. For some reason this
test is skipped on GreenDragon so we've never seen the issue.

[davide]

I wonder whether we could use something like

>>> import os
>>> os.path.basename('/patatino/ino/main.c')
'main.c'

to make this slightly more robust against files which end in main.c but we don't want to really match, e.g. blahmain.c.

[vsk]

I'd be fine with this version of the patch, or one which uses path.basename to be more stringent.

This test is skipped on green dragon because I have not upstreamed the debugger integration for ubsan in compiler-rt yet.

lldb/trunk/packages/Python/lldbsuite/test/functionalities/ubsan/basic/TestUbsanBasic.py

def ubsan_tests(self):
                 "col"])
 
         output_lines = self.res.GetOutput().split('\n')
         json_line = '\n'.join(output_lines[2:])
         data = json.loads(json_line)
 
         self.assertEqual(data["instrumentation_class"], "UndefinedBehaviorSanitizer")
         self.assertEqual(data["description"], "misaligned-pointer-use")
-        self.assertEqual(data["filename"], "main.c")
+        self.assertEqual(os.path.basename(data["filename"]), "main.c")
         self.assertEqual(data["line"], self.line_align)
 
         self.runCmd("continue")