Add syntax for previous commit

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/libvm/src/obj/syn/parser.y

@@ -209,7 +209,7 @@ fn parse_string(input: &str) -> String {
     s
 }
 
-fn parse_reg(input: &str) -> Option<Reg> {
+pub fn parse_reg(input: &str) -> Option<Reg> {
     use regex::Regex;
     use lazy_static::lazy_static;
     lazy_static! {