[3.4 PATCH] PR optimization/9771: Backport from mainline

[Mark Mitchell]

Roger Sayle wrote:

>The following is a backport of the fix for PR rtl-optimization/9771
>from mainline to the gcc-3_4-branch.  9771 is an admittedly obscure
>"wrong-code" bug that is a regression at least from gcc 2.96.  This
>fix has been on mainline for a while without problems.
>
>The following patch has been tested against the gcc-3_4-branch on
>i686-pc-linux-gnu, with a full "make bootstrap", all default languages,
>and regression tested with a top-level "make -k check" with no new
>failures?
>
>Ok for the gcc-3_4-branch?
>  
>
OK.

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Mark Mitchell
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