patch to fix PR66424

[Matthias Klose]

This was marked as a regression in 5 and 6, but never backported to the 
gcc-5-branch. Is it time to backport?

Matthias

On 21.07.2015 21:54, Vladimir Makarov wrote:
>    The following patch fixes
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66424
>
>    The patch was tested and bootstrapped on x86/x86-64.
>
>    Committed as rev. 226053.
>
> 2015-07-21  Vladimir Makarov  <vmakarov@redhat.com>
>
>          PR ipa/66424.
>          * lra-remat.c (operand_to_remat): Prevent using insns with input
>          subregs processed separately by IRA.
>
> 2015-07-21  Vladimir Makarov  <vmakarov@redhat.com>
>
>          PR ipa/66424.
>          * gcc.target/i386/pr66424.c: New.
>
>