re PR tree-optimization/63586 (x+x+x+x -> 4*x in gimple)

re PR tree-optimization/63586 (x+x+x+x -> 4*x in gimple)

gcc/testsuite/ChangeLog:

2016-05-17  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR middle-end/63586
	* gcc.dg/tree-ssa/pr63586-2.c: New test.
	* gcc.dg/tree-ssa/pr63586.c: New test.
	* gcc.dg/tree-ssa/reassoc-14.c: Adjust multiplication count.

gcc/ChangeLog:

2016-05-17  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR middle-end/63586
	* tree-ssa-reassoc.c (transform_add_to_multiply): New.
	(reassociate_bb): Call transform_add_to_multiply.

From-SVN: r236356