re PR middle-end/57393 (error: definition in block 4 follows the use / internal compiler error: verify_ssa failed)

	PR middle-end/57393
	PR tree-optimization/58018
	PR tree-optimization/58131
	* gcc.dg/torture/pr57393-1.c: New test.
	* gcc.dg/torture/pr57393-2.c: New test.
	* gcc.dg/torture/pr57393-3.c: New test.
	* gcc.dg/torture/pr58018.c: New test.
	* gcc.dg/torture/pr58131.c: New test.
	* gfortran.dg/pr57393-1.f90: New test.
	* gfortran.dg/pr57393-2.f90: New test.

From-SVN: r205466