Remove the need for `type_of`, `size_of`, `align_of`, `offset_of` to be keywords

src/check_expr.cpp

@@ -7769,23 +7769,6 @@ ExprKind check_expr_base_internal(CheckerContext *c, Operand *o, Ast *node, Type
 			o->type = t_context;
 			break;
 
-		case Token_size_of:
-			o->mode       = Addressing_Builtin;
-			o->builtin_id = BuiltinProc_size_of;
-			break;
-		case Token_align_of:
-			o->mode       = Addressing_Builtin;
-			o->builtin_id = BuiltinProc_align_of;
-			break;
-		case Token_offset_of:
-			o->mode       = Addressing_Builtin;
-			o->builtin_id = BuiltinProc_offset_of;
-			break;
-		case Token_type_of:
-			o->mode       = Addressing_Builtin;
-			o->builtin_id = BuiltinProc_type_of;
-			break;
-
 		default:
 			error(node, "Illegal implicit name '%.*s'", LIT(i->string));
 			return kind;

src/parser.cpp

@@ -1731,11 +1731,6 @@ Ast *parse_operand(AstFile *f, bool lhs) {
 	case Token_Rune:
 		return ast_basic_lit(f, advance_token(f));
 
-	case Token_size_of:
-	case Token_align_of:
-	case Token_offset_of:
-		return parse_call_expr(f, ast_implicit(f, advance_token(f)));
-
 	case Token_String:
 		return ast_basic_lit(f, advance_token(f));
 
@@ -2016,17 +2011,6 @@ Ast *parse_operand(AstFile *f, bool lhs) {
 		return ast_typeid_type(f, token, nullptr);
 	} break;
 
-	case Token_type_of: {
-		Ast *i = ast_implicit(f, expect_token(f, Token_type_of));
-		Ast *type = parse_call_expr(f, i);
-		while (f->curr_token.kind == Token_Period) {
-			Token token = advance_token(f);
-			Ast *sel = parse_ident(f);
-			type = ast_selector_expr(f, token, type, sel);
-		}
-		return type;
-	} break;
-
 	case Token_Pointer: {
 		Token token = expect_token(f, Token_Pointer);
 		Ast *elem = parse_type(f);

src/tokenizer.cpp

@@ -117,10 +117,6 @@ TOKEN_KIND(Token__KeywordBegin, ""), \
 	TOKEN_KIND(Token_inline,      "inline"),      \
 	TOKEN_KIND(Token_no_inline,   "no_inline"),   \
 	TOKEN_KIND(Token_context,     "context"),     \
-	TOKEN_KIND(Token_size_of,     "size_of"),     \
-	TOKEN_KIND(Token_align_of,    "align_of"),    \
-	TOKEN_KIND(Token_offset_of,   "offset_of"),   \
-	TOKEN_KIND(Token_type_of,     "type_of"),     \
 	TOKEN_KIND(Token_macro,       "macro"),       \
 	TOKEN_KIND(Token_const,       "const"),       \
 TOKEN_KIND(Token__KeywordEnd, ""), \