Change the style of the DO_AST macro to match the others in this file --
semicolons between the code and comments instead of after the comments,
and line continuations in the arbitrary but now consistant column 76.

No functional changes.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@276196 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f