Review Request: JDK-8170633 backslashes in, gensrc/module-info.java comments need escaping

[Bradford Wetmore]

 > The build tool generating module-info.java includes the path name of
 > the source files in the comment for diagnosis where backslash
 > character needs escaping.  This patch prints URI rather than file
 > path.

As submitter and having tested the build patch, looks good to me.

Brad