[unittests][Support] AIX: Skip sticky bit file tests

On AIX, attempting (without root) to set the sticky bit on a file with
the `chmod` utility will give:
```
chmod: not all requested changes were made to <file>
```

The same occurs when modifying other permission bits on a file with the
sticky bit already set.

It seems that the `chmod` function will report success despite failing
to set the sticky bit.

llvm-svn: 350735

1 files changed, 4 insertions, 2 deletions

diff --git a/llvm/unittests/Support/Path.cpp b/llvm/unittests/Support/Path.cpp
index 40faa669f87..21a6aab73af 100644
--- a/llvm/unittests/Support/Path.cpp
+++ b/llvm/unittests/Support/Path.cpp
@@ -1665,7 +1665,9 @@ TEST_F(FileSystemTest, permissions) {
   EXPECT_TRUE(CheckPermissions(fs::set_gid_on_exe));
 
   // Modern BSDs require root to set the sticky bit on files.
-#if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__)
+  // AIX without root will mask off (i.e., lose) the sticky bit on files.
+#if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__) &&  \
+    !defined(_AIX)
   EXPECT_EQ(fs::setPermissions(TempPath, fs::sticky_bit), NoError);
   EXPECT_TRUE(CheckPermissions(fs::sticky_bit));
 
@@ -1685,7 +1687,7 @@ TEST_F(FileSystemTest, permissions) {
 
   EXPECT_EQ(fs::setPermissions(TempPath, fs::all_perms), NoError);
   EXPECT_TRUE(CheckPermissions(fs::all_perms));
-#endif // !FreeBSD && !NetBSD && !OpenBSD
+#endif // !FreeBSD && !NetBSD && !OpenBSD && !AIX
 
   EXPECT_EQ(fs::setPermissions(TempPath, fs::all_perms & ~fs::sticky_bit),
                                NoError);