test/Driver/debug.c: Mark this as "REQUIRES: shell".

Former RUN line does not make sense on Win32 hosts.
Win32 hosts would not be expected to set appropriate $PWD.

Latter RUN line might be made valid if PathV2::is_absolute("/foo") would be true. Unfortunately, "/foo" should not be treated as absolute path on Win32.

FYI, on mingw32 with MSYS bash (it has 'shell' feature);
Former) $PWD is set as "X:/hogehoge/test/Driver"
Latter) PWD=/foo sets "X:/root/to/msys/foo" to $PWD.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@142721 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Driver/debug.c b/test/Driver/debug.c
index 0f5ce2a..ca1ca30 100644
--- a/test/Driver/debug.c
+++ b/test/Driver/debug.c
@@ -7,4 +7,5 @@
 // "PWD=/foo gcc" wouldn't necessarily work. You would need to pick a different
 // path to the same directory (try a symlink).
 
-// XFAIL: win32
+// This depends on host's behavior how $PWD would be set.
+// REQUIRES: shell