[ARM, PATCH] TARGET_LDRD reject Thumb1 targets

[Greta Yorsh]

This patch adjusts the definition of TARGET_LDRD to false on Thumb1 targets,
as suggested here:
http://gcc.gnu.org/ml/gcc-patches/2012-10/msg02048.html

No regression on qemu for arm none-eabi with arch=armv5t/armv7-a
mode=thumb/arm.

Ok for trunk?

Thanks,
Greta

ChangeLog

2012-11-21  Greta Yorsh  <Greta.Yorsh@arm.com>

       * config/arm/arm.h (TARGET_LDRD): Reject Thumb1 targets.
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