Record get_load_store_info results from analysis

The following is a patch to make us record the get_load_store_info
results from load/store analysis and re-use them during transform.
In particular this moves where SLP_TREE_MEMORY_ACCESS_TYPE is stored.

A major hassle was (and still is, to some extent), gather/scatter
handling with it's accompaning gather_scatter_info.  As
get_load_store_info no longer fully re-analyzes them but parts of
the information is recorded in the SLP tree during SLP build the
following goes and eliminates the use of this data in
vectorizable_load/store, instead recording the other relevant
part in the load-store info (namely the IFN or decl chosen).
Strided load handling keeps the re-analysis but populates the
data back to the SLP tree and the load-store info.  That's something
for further improvement.  This also shows that early classifying
a SLP tree as load/store and allocating the load-store data might
be a way to move back all of the gather/scatter auxiliary data
into one place.

Rather than mass-replacing references to variables I've kept the
locals but made them read-only, only adjusting a few elsval setters
and adding a FIXME to strided SLP handling of alignment (allowing
local override there).

The FIXME shows that while a lot of analysis is done in
get_load_store_type that's far from all of it.  There's also
a possibility that splitting up the transform phase into
separate load/store def types, based on VMAT choosen, will make
the code more maintainable.

	* tree-vectorizer.h (vect_load_store_data): New.
	(_slp_tree::memory_access_type): Remove.
	(SLP_TREE_MEMORY_ACCESS_TYPE): Turn into inline function.
	* tree-vect-slp.cc (_slp_tree::_slp_tree): Do not
	initialize SLP_TREE_MEMORY_ACCESS_TYPE.
	* tree-vect-stmts.cc (check_load_store_for_partial_vectors):
	Remove gather_scatter_info pointer argument, instead get
	info from the SLP node.
	(vect_build_one_gather_load_call): Get SLP node and builtin
	decl as argument and remove uses of gather_scatter_info.
	(vect_build_one_scatter_store_call): Likewise.
	(vect_get_gather_scatter_ops): Remove uses of gather_scatter_info.
	(vect_get_strided_load_store_ops): Get SLP node and remove
	uses of gather_scatter_info.
	(get_load_store_type): Take pointer to vect_load_store_data
	instead of individual pointers.
	(vectorizable_store): Adjust.  Re-use get_load_store_type
	result from analysis time.
	(vectorizable_load): Likewise.

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