xfail warp tests and link bug

Author: kmpeng

test/Feature/HLSLLib/mad.fp64.test

@@ -82,6 +82,9 @@ DescriptorSets:
         Binding: 3
 #--- end
 
+# https://github.com/llvm/offload-test-suite/issues/358
+# XFAIL: DirectX-WARP
+
 # REQUIRES: Double
 # RUN: split-file %s %t
 # RUN: %dxc_target -HV 202x -T cs_6_5 -Fo %t.o %t/source.hlsl