bug#18944: 24.4; perl-mode electric-indent inside here documents

[Ed Avis]

When you look at this, if you want to widen the scope of the bug, note that 
recent Perl versions allow indented here-documents using <<~ syntax.

#!/usr/bin/perl
my $x = <<~END
    Here is some indented stuff.
    Because the terminator END is also indented by four spaces,
    those spaces will be stripped off the resulting string.
    END
;
print $x;

That's an example of where Emacs really should indent the content of the 'here 
document', including the terminator.

But for the older style without ~ it really has to be at the left margin, and 
most likely the content of the string will start from the left margin too.


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