[Patch, fortran] [13/14] Support coarray subreferences: don't force coarray lower bound to 1.

[Mikael Morin]

gfc_build_array_type was forcing the lower bound to zero in cases where it was
unspecified (NULL). This is wrong for deferred (allocatable) coarrays at least,
as their cobound is specified at allocation time.
This patch fixes that. 
I don't think other cases beyond AS_DEFERRED need fixing, but I wouldn't mind
a confirmation. ;-)

OK?
 
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2011-10-06  Mikael Morin  <mikael.morin@sfr.fr>

	PR fortran/50420
	* trans-types.c (gfc_build_array_type): Don't force lower bound to one
	in the deferred case.
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