Make aliasing_component_refs_p to work harder when same_type_for_tbaa returns -1
* tree-ssa-alias.c (aliasing_component_refs_p): Do not give up immediately after same_types_for_tbaa_p returns -1 and continue looking for possible exact match; if matching types are arrays watch for partial overlaps. (indirect_ref_may_alias_decl_p): Watch for partial array overlaps. (indirect_refs_may_alias_p): Do type based disambiguation first; update comment. * gcc.dg/lto/alias-access-path-2.0.c: New testcase. From-SVN: r272036
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