Do not use TYPE_CANONICAL in useless_type_conversion

[Alexandre Oliva]

On Oct 13, 2015, Eric Botcazou <ebotcazou@adacore.com> wrote:

> Note that this is PR middle-end/67912.

Thanks.  I added this piece of information to the ChangeLog entry, and
checked the patch in.

-- 
Alexandre Oliva, freedom fighter    http://FSFLA.org/~lxoliva/
You must be the change you wish to see in the world. -- Gandhi
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Free Software Evangelist|Red Hat Brasil GNU Toolchain Engineer