[PUSHED] Handle OP_STRING in dump_subexp_body_standard

[Joel Brobecker]

> (gdb) set debug expression 1
> (gdb) print "hello"
> ... (random garbage, possibly segfault)
[...]
> 2014-07-15  Simon Marchi  <simon.marchi@ericsson.com>
> 
> 	* expprint.c (dump_subexp_body_standard): Handle OP_STRING.

I forgot something! Do you think you could add a test for that?
It should be fairly straightforward to add one, I think.

-- 
Joel