Fix dotest.py '-p' option for multi-process mode

[fjricci]

Summary

The '-p' option for dotest.py was ignored in multiprocess mode,
as the -p argument to the inferior would overwrite the -p argument
passed on the command line.

[tfiala]

That looks fine. Thanks for the fix!

[sas]

Committed as r265422.

packages/Python/lldbsuite/test/dosep.py

def call_with_timeout(
     return process_driver.results
 
 
 def process_dir(root, files, dotest_argv, inferior_pid_events):
     """Examine a directory for tests, and invoke any found within it."""
     results = []
     for (base_name, full_test_path) in files:
         import __main__ as main
+        global dotest_options
+        if dotest_options.p and not re.search(dotest_options.p, base_name):
+            continue
+
         script_file = main.__file__
         command = ([sys.executable, script_file] +
                    dotest_argv +
                    ["--inferior", "-p", base_name, root])
 
         timeout_name = os.path.basename(os.path.splitext(base_name)[0]).upper()
 
         timeout = (os.getenv("LLDB_%s_TIMEOUT" % timeout_name) or