[Patch Vax] zero/sign extend patterns need to be SUBREG aware

[Matt Thomas]

> On Jun 19, 2015, at 8:51 AM, Jan-Benedict Glaw <jbglaw@lug-owl.de> wrote:
> 
> Hi James,
> 
> On Tue, 2015-06-16 10:58:48 +0100, James Greenhalgh <james.greenhalgh@arm.com> wrote:
>> The testcase in this patch, from libgcc, causes an ICE in the Vax
>> build.
> [...]
>> As far as I know, reload is going to get rid of these SUBREGs
>> for us, so we don't need to modify the output statement.
>> 
>> Tested that this restores the VAX build and that the code-gen is
>> sensible for the testcase.
>> 
>> OK?
> 
> Looks good to me, but Matt has to ACK this fix.

I so ACK.