Quotes are your friend ...

shell> cat > J9Test.pm
package J9Test;
1;
shell> perl -MJ9Test -le print $INC{"J9Test.pm"};

shell> perl -MJ9Test -le print@ARGV $INC{"J9Test.pm"};
{J9Test.pm}
shell> perl -MJ9Test -le 'print $INC{"J9Test.pm"};'
J9Test.pm
[download]

Although the above was performed on a linux box using bash (so you might get a different result in a different shell), I'm pretty sure that $INC{"J9Test.pm"} is being passed as the last argument to perl.
HTH

_________
broquaint