[libgfortran,patch] Fix RESHAPE for zero-sized array sections

[François-Xavier Coudert]

Hi all,

Attached patch makes RESHAPE behaves correctly on zero-sized array
sections (PR 27895). I don't know why I didn't spot it last time I
looked, as it's really easy: at the start of the routine, when
counting dimensions and extents, you simply use flags to mark if
either source or pad arrays are zero-sized (the flags are named
sempty, pempty). Then, before the main loop, you take the appropriate
action.

This patch fixes an embarassing wrong-code bug, as wrong-code always
are. Regtested on i686-linux (well, on a revision before the bootstrap
breakage :)   OK for mainline, 4.2 and 4.1?

FX

:ADDPATCH libgfortran:
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