[lldb] [test/lldb-vscode] Use realpath to match vscode behavior

[mgorny]

Summary

Compare the directory paths returned by lldb-vscode against realpaths
rather than apparent paths. This matches lldb-vscode behavior
and therefore fixes test failures when one of the parent directories
of the source tree is a symlink.

[mgorny]

FTR, the failure fixed by this is: http://lab.llvm.org:8011/builders/netbsd-amd64/builds/21195/steps/run%20unit%20tests/logs/FAIL%3A%20lldb-Suite%3A%3ATestVSCode_launch.py

[labath]

LG, just please replace os.path.split(foo)[0] by os.path.dirname(foo).

lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/launch/TestVSCode_launch.py

class TestVSCode_launch(lldbvscode_testcase.VSCodeTestCaseBase):
     @skipIfDarwin # Skip this test for now until we can figure out why tings aren't working on build bots
     @no_debug_info_test
     def test_cwd(self):
         '''
             Tests the default launch of a simple program with a current working
             directory.
         '''
         program = self.getBuildArtifact("a.out")
-        program_parent_dir = os.path.split(os.path.split(program)[0])[0]
+        program_parent_dir = os.path.realpath(
+            os.path.split(os.path.split(program)[0])[0])
         self.build_and_launch(program,
                               cwd=program_parent_dir)
         self.continue_to_exit()
         # Now get the STDOUT and verify our program argument is correct
         output = self.get_stdout()
         self.assertTrue(output and len(output) > 0,
                         "expect program output")
         lines = output.splitlines()
class TestVSCode_launch(lldbvscode_testcase.VSCodeTestCaseBase):
     @skipIfDarwin # Skip this test for now until we can figure out why tings aren't working on build bots
     @no_debug_info_test
     def test_debuggerRoot(self):
         '''
             Tests the "debuggerRoot" will change the working directory of
             the lldb-vscode debug adaptor.
         '''
         program = self.getBuildArtifact("a.out")
-        program_parent_dir = os.path.split(os.path.split(program)[0])[0]
+        program_parent_dir = os.path.realpath(
+            os.path.split(os.path.split(program)[0])[0])
         commands = ['platform shell echo cwd = $PWD']
         self.build_and_launch(program,
                               debuggerRoot=program_parent_dir,
                               initCommands=commands)
         output = self.get_console()
         self.assertTrue(output and len(output) > 0,
                         "expect console output")
         lines = output.splitlines()