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


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

-----

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.

Attachment: aarch64-add-a53-pipeline.diff
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