gimple-ssa-strength-reduction.c (find_basis_for_candidate): Guard the get_alternative_base call with flag_expensive_optimizations.

gcc/

	* gimple-ssa-strength-reduction.c (find_basis_for_candidate): Guard
	the get_alternative_base call with flag_expensive_optimizations.
	(alloc_cand_and_find_basis): Likewise.

From-SVN: r205713