When using a deprecated flag that have been converted to UL,
we print the wrong hint when it contains more than 1 tag.
The message show: -Xlog:x1,x2,..=level
it should be: -Xlog:x1+x2+..=level
we print the wrong hint when it contains more than 1 tag.
The message show: -Xlog:x1,x2,..=level
it should be: -Xlog:x1+x2+..=level