[PATCH GCC][10/13]Compute and cache data dependence relation

[Bin Cheng]

Hi,
This patch computes and caches data dependence relation in a hash table
so that it can be queried multiple times later for partition dependence
check.
Bootstrap and test on x86_64 and AArch64.  Is it OK?

Thanks,
bin

2017-06-07  Bin Cheng  <bin.cheng@arm.com>

	* tree-loop-distribution.c (struct ddr_entry, ddr_entry_hasher): New.
	(ddr_entry_hasher::hash, ::equal, get_data_dependence): New function.
	(ddrs_vec, ddrs_table): New.
	(classify_partition): Call get_data_dependence.
	(pg_add_dependence_edges): Ditto.
	(distribute_loop): Initialize data dependence global variables.
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