tree-ssa-sccvn.c (vn_reference_lookup_3): Avoid doing work twice.

tree-ssa-sccvn.c (vn_reference_lookup_3): Avoid doing work twice.

2010-11-23  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-sccvn.c (vn_reference_lookup_3): Avoid doing work
	twice.  Avoid re-allocating the ops vector all the time.

2010-11-23  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-alias.c (refs_may_alias_p_1): Avoid calls to
	is_gimple_min_invariant, group tree code checks to allow
	combining them.
	(stmt_may_clobber_ref_p_1): Check for SSA_NAME instead
	of is_gimple_reg.

From-SVN: r167072