XFAIL for cygwin.

Looks like symbol resolution is not working on cygwin, the test fails
because __gxx_personality_v0 is not found.

llvm-svn: 181179
diff --git a/llvm/test/ExecutionEngine/MCJIT/eh.ll b/llvm/test/ExecutionEngine/MCJIT/eh.ll
index 4bc7049..46210ae 100644
--- a/llvm/test/ExecutionEngine/MCJIT/eh.ll
+++ b/llvm/test/ExecutionEngine/MCJIT/eh.ll
@@ -1,5 +1,5 @@
 ; RUN: %lli_mcjit %s
-; XFAIL: powerpc64, arm
+; XFAIL: powerpc64, arm, cygwin
 declare i8* @__cxa_allocate_exception(i64)
 declare void @__cxa_throw(i8*, i8*, i8*)
 declare i32 @__gxx_personality_v0(...)