Don't source local .lldbinit in the test suite

[teemperor]

Summary

As suggested by Pavel, we shouldn't let our tests parse the local .lldbinit to prevent random test failures
due to changed settings.

Fixes Minidump/Windows/Sigsegv/sigsegv.test (and probably others too).

[labath]

Are you sure you're adding this to the right place? This is modifying the substitution for lldb-mi and not lldb..

[teemperor]

Ah yes, that also explains why the test suit failed. Fixed and the test now passes, thanks!

[labath]

lgtm

lit/helper/toolchain.py

def use_lldb_substitutions(config):
     if config.lldb_lit_tools_dir:
         build_script_args.append('--tools-dir={0}'.format(config.lldb_lit_tools_dir))
     if config.lldb_tools_dir:
         build_script_args.append('--tools-dir={0}'.format(config.lldb_tools_dir))
 
     primary_tools = [
         ToolSubst('%lldb',
                   command=FindTool('lldb'),
-                  extra_args=['-S',
+                  extra_args=['--no-lldbinit', '-S',
                               os.path.join(config.test_source_root,
                                            'lit-lldb-init')]),
         lldbmi,
         ToolSubst('%debugserver',
                   command=FindTool(dsname),
                   extra_args=dsargs,
                   unresolved='ignore'),
         'lldb-test',