[PATCH] Remove bogus assert from CCP's insert_clobbers_for_var

[Eric Botcazou]

> On IRC I've been told that is OK and the that CCP cannot make such
> assumtions.  Since it is only a missed-optimization if the call to the
> builtin is not found and processed (basically PR 51491 again but only
> in cases like these), I thought it best to just remove the assert by
> the following simple patch, bootstrapped and tested on x86_64-linux.

Please do that on the 4.7 branch as well if the assertion is incorrect.

-- 
Eric Botcazou