[AARCH64][Insn classification unification 4/N] load/store types

[Sofiane Naci]

Hi,

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

This patch adds "load_acq" and "store_rel" types for classifying load
acquire and store release instructions respectively. It also updates the
ARMv8 pipeline descriptions.

OK for trunk?

Thanks
Sofiane

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ChangeLog:

	* config/arm/types.md (define_attr "type"): Add "load_acq" and
"store_rel".
	* config/arm/cortex-a53.md (cortex_a53_load1): Update for attribute
	changes.
	(cortex_a53_store1): Likewise.
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