disable pipefail for ubsan.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@187273 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/ubsan/lit_tests/lit.cfg b/lib/ubsan/lit_tests/lit.cfg
index ace46a7..f3fc646 100644
--- a/lib/ubsan/lit_tests/lit.cfg
+++ b/lib/ubsan/lit_tests/lit.cfg
@@ -58,3 +58,5 @@
 # Linux and Darwin only.
 if config.host_os not in ['Linux', 'Darwin']:
   config.unsupported = True
+
+config.pipefail = False