PR tree-optimization/86829
	* match.pd (sin (atan (x))): New simplification rules.
	(cos (atan (x))): Likewise.
	* real.c (build_sinatan_real): New function.
	* real.h (build_sinatan_real): Prototype.

	PR tree-optimization/86829
	* gcc.dg/sinatan-1.c: New test.
	* gcc.dg/sinatan-2.c: New test.
	* gcc.dg/sinatan-3.c: New test.

From-SVN: r265064