Add workaround to build scoped enums with VS2015. NFCI.

We need this as we still have internal build bots on VS2015.

llvm-svn: 356532

include/llvm/Remarks/Remark.h

@@ -62,7 +62,7 @@ enum class Type {
 /// A remark type used for both emission and parsing.
 struct Remark {
   /// The type of the remark.
-  enum Type RemarkType = Type::Unknown;
+  enum class Type RemarkType = Type::Unknown;
 
   /// Name of the pass that triggers the emission of this remark.
   StringRef PassName;

lib/Remarks/RemarkParserImpl.h

@@ -21,7 +21,7 @@ struct ParserImpl {
 
   // The parser kind. This is used as a tag to safely cast between
   // implementations.
-  enum Kind ParserKind;
+  enum class Kind ParserKind;
 };
 } // end namespace remarks
 } // end namespace llvm