Clean up `parse_bottom_expr` to use list parsing utility

[estebank]

From #63337 (comment)

The following code should be using the common list parsing utilities:

rust/src/libsyntax/parse/parser.rs

Lines 2052 to 2070 in 2d1a551

	while self.token != token::CloseDelim(token::Paren) {
	es.push(match self.parse_expr() {
	Ok(es) => es,
	Err(err) => {
	// recover from parse error in tuple list
	return Ok(self.recover_seq_parse_error(token::Paren, lo, Err(err)));
	}
	});
	recovered = self.expect_one_of(
	&[],
	&[token::Comma, token::CloseDelim(token::Paren)],
	)?;
	if self.eat(&token::Comma) {
	trailing_comma = true;
	} else {
	trailing_comma = false;
	break;
	}
	}

CC @Centril

[achan1989]

What/where are the common list parsing utilties?
Edit: never mind, I've got it. parse_paren_comma_seq, parse_seq_to_end, etc. for anyone who's wondering.