[Patch, fortran] PR18082 - gfortran gets stuck in loop with automatic length characters

[Paul Thomas]

:ADDPATCH fortran:

This gets stuck in a loop whilst trying to treat the assignments:

subroutine snafu (i)
character*(i) :: c1, c2
c1 = ""
c2 = ""
end subroutine snafu

Declaring c1 and c2 in separate statements clears the problem.
The reason for the problem is that both symbols get assigned the same 
typespec in decl.c(variable_decl) and so the same character length and 
corresponding backend declaration.   This is not good for automatic 
character lengths.   The attached patch fixes this by doling out a new 
typespec for all except constant expressions.

Bubblestrapped and regtested on Cygwin_NT/Athlon.

OK for mainline and 4.0?

Paul T
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