re PR tree-optimization/83232 (fma3d spec2000 regression on zen with -Ofast (generic tuning) after r255268 by missed SLP oppurtunity)

2017-12-01  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/83232
	* tree-vect-data-refs.c (vect_analyze_data_ref_accesses): Fix
	detection of same access. Instead of breaking the group here
	do not consider the duplicate.  Add comment explaining real fix.

	* gfortran.dg/vect/pr83232.f90: New testcase.

From-SVN: r255307