Removing LLVM_DELETED_FUNCTION, as MSVC 2012 was the last reason for requiring the macro. NFC; LLVM edition.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229340 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Option/OptSpecifier.h

@@ -21,7 +21,7 @@ namespace opt {
     unsigned ID;
 
   private:
-    explicit OptSpecifier(bool) LLVM_DELETED_FUNCTION;
+    explicit OptSpecifier(bool) = delete;
 
   public:
     OptSpecifier() : ID(0) {}