[PATCH][GCC][mid-end] Fix single use requirement for xorsign (x * copysign (1, y))

[Tamar Christina]

Hi All,

This patch fixes the placement of the single-use requirement for xorsign.

on `x = a * copysign (1, b)` the intention was that `copysign (1, b)` be
single use, and not `x`. Requiring `x` to be single use blocks transformation
where we do want it to occur.

Regtested on aarch64-none-linux-gnu and no regressions
(only target currently supporting this).

Ok for trunk?

gcc/
2017-08-22  Tamar Christina  <tamar.christina@arm.com>

	PR middle-end/19706
	* tree-ssa-math-opts.c (convert_expand_mult_copysign):
	Fix single-use check.

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