[PATCH GCC][2/6]Factor out code pruning runtime alias checks

[Bin Cheng <Bin dot Cheng at arm dot com>]

Hi,
This is the second patch in the set, it factors out code pruning runtime alias
checks from file tree-vect-data-refs.c to tree-data-ref.c.  It also introduces
new interface prune_runtime_alias_test_list so that we can use it in pass like
loop distribution.
Bootstrap and test on x86_64 and AArch64, is it OK?

Thanks,
bin
2017-05-22  Bin Cheng  <bin.cheng@arm.com>

	* tree-vect-data-refs.c (Operator==, comp_dr_with_seg_len_pair):
	Move from ...
	* tree-data-ref.c (Operator==, comp_dr_with_seg_len_pair): To here.
	* tree-vect-data-refs.c (vect_prune_runtime_alias_test_list): Factor
	out code pruning runtime alias checks.
	* tree-data-ref.c (prune_runtime_alias_test_list): New function
	factored out from above.
	* tree-vectorizer.h (struct dr_with_seg_len, dr_with_seg_len_pair_t):
	Move from ...
	* tree-data-ref.h (struct dr_with_seg_len, dr_with_seg_len_pair_t):
	... to here.
	(prune_runtime_alias_test_list): New decalaration.

Attachment: 0002-prune-runtime-alias-check-20170516.txt
Description: 0002-prune-runtime-alias-check-20170516.txt