PR c++/25874
	* omp-low.c (expand_omp_parallel): If child_cfun->cfg, free dominators,
	post dominators and cleanup cfg before returning.

	* gcc.dg/gomp/pr25874.c: Add dg-options.
	* g++.dg/gomp/pr25874.C: Add dg-options.

From-SVN: r123822