This patch improves the dependence analysis by allowing the extraction
of a constant offset from a base object when the base object address is
computed in a different statement. The patch passed bootstrap and make
check on amd64-linux. 

2007-07-30  Jan Sjodin  <jan.sjodin@amd.com>

	* tree-data-ref.c
	(split_constant_offset): Enable split_constant_offset to extract
	constants from other statements.
	* tree-vect-transform.c
	(vect_create_addr_base_for_vector_ref): Generate data_ref_base
	to a temp var. Force base_offset to be simple.

2007-07-30  Jan Sjodin  <jan.sjodin@amd.com>

	* gcc.dg/vect/vect-117.c: New test.
	* gcc.dg/vect/vect-74.c: Enabled test
	* gcc.dg/vect/vect-81.c: Enabled test