Review request 8153211: Convert build tool to use the new -XaddExports syntax in bootcycle build

[Mandy Chung]

A few build tools are using the old -XaddExports syntax that should switch to 
the new syntax:
  http://cr.openjdk.java.net/~mchung/jdk9/webrevs/8153211/webrev.00/

Mandy