[autovect] [patch] Extend a support for COMPONENT_REFs.

[Ira Rosen]

This patch extends a support for COMPONENT_REFs: in functions
record_ptr_differ_p and record_array_differ_p we now  peel the data-refs
until we get a declaration or an INDIRECT_REF, e.g., for 'a.b.c[]' we will
get 'a' and then decide if it differs from the second data-ref.

Bootstrapped and tested on ppc-darwin.

Committed to autovect branch.

Ira


ChangeLog entry:

      * tree-data-ref.c (record_ptr_differ_p): Peel COMPONENT_REFs to get
to the base.
      (record_array_differ_p): Likewise.

Patch:
(See attached file: diff.june12)

Testcases:
(See attached file: vect-115.c)(See attached file: vect-7.f90)
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