[Patch, fortran] Remove gfc_conv_section_upper_bound

[Mikael Morin]

Hello,

gfc_conv_section_upper_bound is the same code as the upper bound parts 
of gfc_conv_section_startstride, with the difference that it returns a 
NULL value in the vector subscript case, instead of a gfc_index_zero_node.
The attached patch moves that difference into 
gfc_conv_section_startstride and removes gfc_conv_section_upper_bound.

No testsuite regression on x86_64-unknown-freebsd8.0. OK for trunk ?

Mikael
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