XFAIL Windows test failures under test/libcxx

This patch XFAIL's a number of tests under test/libcxx when on Windows.
These failures need more investigation or patches to either Clang or libc++
but for now we don't want them to prevent the bot from going green.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@300941 91177308-0d34-0410-b5e6-96231b3b80d8

test/libcxx/thread/thread.mutex/thread_safety_lock_guard.pass.cpp

@@ -7,6 +7,10 @@
 //
 //===----------------------------------------------------------------------===//
 
+// On Windows Clang bugs out when both __declspec and __attribute__ are present,
+// the processing goes awry preventing the definition of the types.
+// XFAIL: LIBCXX-WINDOWS-FIXME
+
 // UNSUPPORTED: libcpp-has-no-threads
 // REQUIRES: thread-safety
 

test/libcxx/thread/thread.mutex/thread_safety_lock_unlock.pass.cpp

@@ -7,6 +7,10 @@
 //
 //===----------------------------------------------------------------------===//
 
+// On Windows Clang bugs out when both __declspec and __attribute__ are present,
+// the processing goes awry preventing the definition of the types.
+// XFAIL: LIBCXX-WINDOWS-FIXME
+
 // UNSUPPORTED: libcpp-has-no-threads
 // REQUIRES: thread-safety
 

test/libcxx/thread/thread.mutex/thread_safety_missing_unlock.fail.cpp

@@ -7,6 +7,10 @@
 //
 //===----------------------------------------------------------------------===//
 
+// On Windows Clang bugs out when both __declspec and __attribute__ are present,
+// the processing goes awry preventing the definition of the types.
+// XFAIL: LIBCXX-WINDOWS-FIXME
+
 // UNSUPPORTED: libcpp-has-no-threads
 // REQUIRES: thread-safety
 

test/libcxx/thread/thread.mutex/thread_safety_requires_capability.pass.cpp

@@ -7,6 +7,10 @@
 //
 //===----------------------------------------------------------------------===//
 
+// On Windows Clang bugs out when both __declspec and __attribute__ are present,
+// the processing goes awry preventing the definition of the types.
+// XFAIL: LIBCXX-WINDOWS-FIXME
+
 // UNSUPPORTED: libcpp-has-no-threads
 // REQUIRES: thread-safety