[NFC] AST: Removed dead #define.

It was once used for materializeForSet.

Author: nate-chandler

include/swift/AST/AccessorKinds.def

@@ -108,11 +108,6 @@
 #define INIT_ACCESSOR(ID, KEYWORD) SINGLETON_ACCESSOR(ID, KEYWORD)
 #endif
 
-// Suppress entries for accessors which can't be written in source code.
-#ifndef SUPPRESS_ARTIFICIAL_ACCESSORS
-#define SUPPRESS_ARTIFICIAL_ACCESSORS 0
-#endif
-
 /// This is a getter: a function that is called when a value is loaded
 /// from the storage.  It returns an owned value of the storage type.
 ///

lib/Parse/ParseDecl.cpp

@@ -7945,7 +7945,6 @@ static ParserStatus parseAccessorIntroducer(Parser &P,
     Status.setIsParseError();
     return Status;
   }
-#define SUPPRESS_ARTIFICIAL_ACCESSORS 1
 #define ACCESSOR_KEYWORD(KEYWORD)
 #define SINGLETON_ACCESSOR(ID, KEYWORD)                                        \
   else if (P.Tok.getRawText() == #KEYWORD) {                                   \