[AARCH64] Add SHORT scalar load/store using B/H registers

[Sofiane Naci]

Hi,

This patch adds support in AArch64 for scalar loads and stores to and from
B/H registers.
This has been tested with a full regression run on aarch64-elf.

OK for trunk and 4.8?

Thanks
Sofiane

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2013-03-28  Sofiane Naci  <sofiane.n...@arm.com>

        * config/aarch64/aarch64.md (*mov<mode>_aarch64): Add variants for
scalar
        load/store operations using B/H registers.
        (*zero_extend<SHORT:mode><GPI:mode>2_aarch64): Likewise.

aarch64-scalar-load-store.patch
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