[libunwind] [test] Fix inferring source paths

Fix two issues that caused libcxx source path not to be inferred
correctly when not specified explicitly:

1. get_lit_conf() uses default value only if the lit variable is set
   to None.  Due to the mehod of substituting lit.site.cfg, they were
   "" rather than None when unset, effectively causing the default never
   to apply.  Instead, use 'or' construct to use the default whenever
   get_lit_conf() returns a false value.

2. If os.path.join() is given a component starting with '/', it takes
   it to be an absolute path and ignores everything preceding it.
   Remove the slash to correctly append subdirectory.

With these two fixes, libunwind tests start working on NetBSD buildbot

Differential Revision: https://reviews.llvm.org/D62005

git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@361931 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/libunwind/test/config.py b/test/libunwind/test/config.py
index 8034625..05e3f3c 100644
--- a/test/libunwind/test/config.py
+++ b/test/libunwind/test/config.py
@@ -21,12 +21,10 @@
         self.libcxx_src_root = None
     def configure_src_root(self):
-        self.libunwind_src_root = self.get_lit_conf(
-            'libunwind_src_root',
-            os.path.dirname(self.config.test_source_root))
-        self.libcxx_src_root = self.get_lit_conf(
-            'libcxx_src_root',
-            os.path.join(self.libunwind_src_root, '/../libcxx'))
+        self.libunwind_src_root = (self.get_lit_conf('libunwind_src_root')
+            or os.path.dirname(self.config.test_source_root))
+        self.libcxx_src_root = (self.get_lit_conf('libcxx_src_root')
+            or os.path.join(self.libunwind_src_root, '..', 'libcxx'))
     def configure_obj_root(self):
         self.libunwind_obj_root = self.get_lit_conf('libunwind_obj_root')