[AARCH64][Insn classification unification 2/N] Add cortex-a53 pipeline description

[Sofiane Naci]

Hi,

This patch is part of the ongoing work to unify instruction classification
between the ARM and AARCH64 backends.

This patch wires up the cortex-a53 pipeline description defined in the ARM
backend to be used in the AARCH46 backend.

OK for trunk?

Thanks
Sofiane

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ChangeLog

        * config.gcc (aarch64*-*-*): Add aarch-common.o to extra_objs.  Add
        aarch-common-protos.h to extra_headers.
        (aarch64*-*-*): Add arm/aarch-common-protos.h to tm_p_file.
        * config/aarch64/aarch64.md: Include "../arm/cortex-a53.md"
        * config/aarch64/t-aarch64 (aarch-common.o): Define.

aarch64-add-a53-pipeline.diff
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