[PATCH, ARM] emit LDRD epilogue instead of a single LDM return

[Greta Yorsh]

Currently, epilogue is not generated in RTL for function that can return
using a single instruction. This patch enables RTL epilogue for such
functions on targets that can benefit from using a sequence of LDRD
instructions in epilogue instead of a single LDM instruction.

No regression on qemu arm-none-eabi with cortex-a15.

Ok for trunk?

Thanks,
Greta

gcc/

2012-10-19  Greta Yorsh  <Greta.Yorsh at arm.com>

        * config/arm/arm.c (use_return_insn): Return 0 for targets that
        can benefit from using a sequence of LDRD instructions in epilogue
        instead of a single LDM instruction.
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