raw_ostream: Forward declare OpenFlags and include FileSystem.h only where necessary.

llvm-svn: 207593
diff --git a/llvm/lib/ProfileData/InstrProfIndexed.h b/llvm/lib/ProfileData/InstrProfIndexed.h
index ede5368..7761704 100644
--- a/llvm/lib/ProfileData/InstrProfIndexed.h
+++ b/llvm/lib/ProfileData/InstrProfIndexed.h
@@ -14,6 +14,7 @@
 #ifndef LLVM_PROFILEDATA_INSTRPROF_INDEXED_H_
 #define LLVM_PROFILEDATA_INSTRPROF_INDEXED_H_
 
+#include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/MD5.h"
 
 namespace llvm {