[Lit] Pass through SSH_AUTH_SOCK from the surrounding environment

This allows running Lit tests that run ssh without having to manually
enter a password (which is inconvenient), by just having ssh-agent
setup properly when running the test suite.

diff --git a/llvm/utils/lit/lit/TestingConfig.py b/llvm/utils/lit/lit/TestingConfig.py
index cfc0dab..38d0506 100644 (file)
--- a/llvm/utils/lit/lit/TestingConfig.py
+++ b/llvm/utils/lit/lit/TestingConfig.py
@@ -23,7 +23,7 @@ class TestingConfig(object):
 
         pass_vars = ['LIBRARY_PATH', 'LD_LIBRARY_PATH', 'SYSTEMROOT', 'TERM',
                      'CLANG', 'LD_PRELOAD', 'ASAN_OPTIONS', 'UBSAN_OPTIONS',
-                     'LSAN_OPTIONS', 'ADB', 'ANDROID_SERIAL',
+                     'LSAN_OPTIONS', 'ADB', 'ANDROID_SERIAL', 'SSH_AUTH_SOCK',
                      'SANITIZER_IGNORE_CVE_2016_2143', 'TMPDIR', 'TMP', 'TEMP',
                      'TEMPDIR', 'AVRLIT_BOARD', 'AVRLIT_PORT',
                      'FILECHECK_OPTS', 'VCINSTALLDIR', 'VCToolsinstallDir',