Remove `const` as a (reserved) keyword

src/parser.cpp

@@ -3259,11 +3259,10 @@ FieldPrefixKind is_token_field_prefix(AstFile *f) {
 				return FieldPrefix_no_alias;
 			} else if (f->curr_token.string == "c_vararg") {
 				return FieldPrefix_c_var_arg;
+			} else if (f->curr_token.string == "const") {
+				return FieldPrefix_const;
 			}
 			break;
-
-		case Token_const:
-			return FieldPrefix_const;
 		}
 		return FieldPrefix_Unknown;
 	}

src/tokenizer.cpp

@@ -119,7 +119,6 @@ TOKEN_KIND(Token__KeywordBegin, ""), \
 	TOKEN_KIND(Token_context,     "context"),     \
 	TOKEN_KIND(Token_asm,         "asm"),         \
 	TOKEN_KIND(Token_macro,       "macro"),       \
-	TOKEN_KIND(Token_const,       "const"),       \
 TOKEN_KIND(Token__KeywordEnd, ""), \
 	TOKEN_KIND(Token_Count, "")