This adds back a folding that worked in GCC 4.5 times by amending
the pattern that handles other cases of address vs. SSA name
comparisons.

2020-02-04  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/93538
	* match.pd (addr EQ/NE ptr): Amend to handle &ptr->x EQ/NE ptr.

	* gcc.dg/tree-ssa/forwprop-38.c: New testcase.