[fortran,patch] Fix PR 34956 by not checking bounds of absent optional arguments

[FX Coudert]

valgrind revealed the use of an uninitialized value in gfortran.dg/ 
bounds_check_9.f90 compiled with -fbounds-check, due to bounds- 
checking being performend on an absent optional argument. There  
already was some code to check for optional args, but it only covered  
half of the bound-checking; IIRC, I was the one who wrote it in the  
first place, so I can only apologize for the bad initial fix.

Bootstrapped and regtested on x86_64-linux, checked the tree dump and  
with valgrind that the issue was take care of. No testcase, because I  
can't seem to think of a way to get it to appear without valgrind  
(and the original testcase, of course, is already in the testsuite).

OK to commit?

FX

-- 
François-Xavier Coudert
http://www.homepages.ucl.ac.uk/~uccafco/
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