Try to appease a buildbot

The builder complains thusly:
error C2027: use of undefined type 'llvm::raw_ostream'

Try to make it happy by including raw_ostream.h

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255425 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/EHPersonalities.cpp

@@ -14,6 +14,7 @@
 #include "llvm/IR/Function.h"
 #include "llvm/IR/Instructions.h"
 #include "llvm/Support/Debug.h"
+#include "llvm/Support/raw_ostream.h"
 using namespace llvm;
 
 /// See if the given exception handling personality function is one that we