[libSyntax] Classify pound directives as build config keywords

Author: ahoppen

lib/Syntax/SyntaxClassifier.cpp.gyb

@@ -56,7 +56,7 @@ getContextFreeClassificationForToken(TokenSyntax TokenNode) {
 #define POUND_KEYWORD(KW) case tok::pound_##KW: return SyntaxClassification::Keyword;
 #define POUND_OBJECT_LITERAL(KW, desc, proto) case tok::pound_##KW: return SyntaxClassification::ObjectLiteral;
 #define POUND_DIRECTIVE_KEYWORD(KW) case tok::pound_##KW: return SyntaxClassification::PoundDirectiveKeyword;
-#define POUND_COND_DIRECTIVE_KEYWORD(KW) case tok::pound_##KW: return SyntaxClassification::PoundDirectiveKeyword;
+#define POUND_COND_DIRECTIVE_KEYWORD(KW) case tok::pound_##KW: return SyntaxClassification::BuildConfigKeyword;
 #include "swift/Syntax/TokenKinds.def"
   // Punctuators
   case tok::l_paren: