[PATCH, fortran] Simplify constant substrings

[David Edelsohn]

>>>>> Paul Brook writes:

Paul> Your original submission did not mention either of these things. As an 
Paul> experienced gcc contributor you should know to include this information.

	I am trying to get feedback on the general gfortran design and
infrastructure and on the approach of my patches as I learn to work in
those areas.  Replies telling me to fix other, related bugs or other
messages using a negative tone are not encouraging to me or to other
developers.  If you or others want to politely make those requests as part
of feedback of the actual patch, that's great, otherwise the comments are
not very productive.

	Neither the negative tone nor the sarcastic tone is appropriate,
so please stop.

David