[PATCH PR85793]Fix ICE by loading vector(1) scalara_type for 1 element-wise case

[Bin Cheng]

Hi,
This patch fixes ICE by loading vector(1) scalar_type if it's 1 element-wise for VMAT_ELEMENTWISE.
Bootstrap and test on x86_64 and AArch64 ongoing.  Is it OK?

Thanks,
bin
2018-05-16  Bin Cheng  <bin.cheng@arm.com>
	    Richard Biener  <rguenther@suse.de>

	PR tree-optimization/85793
	* tree-vect-stmts.c (vectorizable_load): Handle 1 element-wise load
	for VMAT_ELEMENTWISE.

gcc/testsuite
2018-05-16  Bin Cheng  <bin.cheng@arm.com>

	PR tree-optimization/85793
	* gcc.dg/vect/pr85793.c: New test.
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