[PATCH] match.pd: Fold x/sqrt(x) to sqrt(x)

This patch adds a pattern in match.pd folding x/sqrt(x) to sqrt(x) for -funsafe-math-optimizations. Test cases were added for double, float, and long double.

The patch was bootstrapped and regtested on aarch64-linux-gnu, no regression.
Ok for mainline?

Signed-off-by: Jennifer Schmitz <jschmitz@nvidia.com>

gcc/

	* match.pd: Fold x/sqrt(x) to sqrt(x).

gcc/testsuite/

	* gcc.dg/tree-ssa/sqrt_div.c: New test.