[gfortran,commited] Add variable name and locus for -fbounds-check

[François-Xavier Coudert]

Hi all,

The attached patch (bounds_check.diff), commited minutes ago to  
mainline, makes sure we generate runtime error messages for -fbounds- 
check on arrays that include the correct variable name and locus. It  
was bootstrapped & regtested on i686-linux both with and without - 
fbounds-check.

Before that patch, there were cases where we didn't use a variable  
name, leading to weird error messages, or where we didn't have access  
to the precise locus for the guilty code. I used the second patch  
(bounds_check_detect.diff) to detect such cases in the whole  
testsuite. I studied the cases where we didn't include correct  
variable name and locus information, and added these to the front-end.

I intend to backport this patch to 4.2, as it has very low risk and  
only affects code compiled with -fbounds-check.

Thanks,
FX

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