Fix powerpc64 g77

[Mark Mitchell]

> | If you saw this code:
> |
> |   if (TARGET_HAS_FOO) {
> |     x = 1 / 0;
> |   }
> |
> | and TARGET_HAS_FOO was 0, wouldn't you want a warning?
>
> No.  By no means.

Well, we are definitely on opposite sides of the fence on this one.

At some point down the road, we will have to get a community consensus
so that we know what to do in our compiler.

-- 
Mark Mitchell                mark@codesourcery.com
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