re PR tree-optimization/88932 (ICE: verify_ssa failed (Error: definition in block 29 does not dominate use in block 25))

	PR tree-optimization/88932
	* tree-predcom.c (try_combine_chains): Get loop bbs in dom order.

	gcc/testsuite
	* gfortran.dg/pr88932.f90: New test.

From-SVN: r268439