[PATCH 2/3] Vect peeling cost model

[Robin Dapp]

Wrap some frequently used snippets in separate functions.

gcc/ChangeLog:

2017-04-26  Robin Dapp  <rdapp@linux.vnet.ibm.com>

	* tree-vect-data-refs.c (vect_update_misalignment_for_peel): Rename.
	(vect_get_peeling_costs_all_drs): Create function.
	(vect_peeling_hash_get_lowest_cost):
	Use vect_get_peeling_costs_all_drs.
	(vect_peeling_supportable): Create function.
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