Font lock bug in sh-script.el

[Richard Stallman]

This shell script

 svrmgrl <<        EOF
     CONNECT INTERNAL
     STARTUP
     EXIT
        EOF

 while
 # foo

seems to confuse sh-script.el's font lock support.
All the text following the first line is treated as a here-document.

Note that all the spaces in this test case are ordinary spaces.
(Someone else reported a bug involving non-breaking spaces.)

Would you please look at this?