tree-vect-loop-manip.c (rename_variables_in_bb): Rename PHI nodes when copying loop nest with only one inner loop.

	* tree-vect-loop-manip.c (rename_variables_in_bb): Rename PHI nodes
	when copying loop nest with only one inner loop.

	gcc/testsuite
	* gcc.dg/tree-ssa/ldist-34.c: New test.

From-SVN: r253586