[fortran,committed] Conditional bounds-checking for optional dummies

[FX Coudert]

Attached patch, committed as rev. 128587 (http://gcc.gnu.org/viewcvs? 
view=rev&revision=128587), simply fixes our -fbounds-check testing by  
performing it only when optional arguments are actually present. Now,  
that's wise thinking, isn't it? Yet, I took few months to actually do  
it :(

Bootstrapped and regtested on x86_64-linux, both without and with - 
fbounds-check.

FX


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