[PATCH] Provide inlining context in strict-overflow warnings

[Florian Weimer]

Patterns that trigger the optimization and warning can form after 
inlining, and it can be rather difficult to figure out what exactly is 
causing the warning.  The inlining context at least provides additional 
hints, enabling developers to substitute the arguments and discover 
what, precisely, is happening.

More context is provided with -g than without, but I think this is 
acceptable.

I bootstrapped and tested the attached patch on x86_64-redhat-linux-gnu, 
with no new regressions.

-- 
Florian Weimer / Red Hat Product Security Team
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