[alias-export] Merge with trunk, apply expand from SSA patch

[Andrey Belevantsev]

Hello,

Michael Matz's expand from SSA patch allows simplifying alias export 
pretty much, because we don't need to track the substitutions happened 
within tree-outof-ssa.c to locate the proper PTA info, but instead we 
can take it directly from SSA_NAME.  The only extra change needed is not 
releasing ssa-names in delete_tree_ssa, so that the oracle can pick up 
the proper types later in the pipeline.

Bootstrapped (c/c++/fortran) on x86-64, committed to alias-export 
branch.  The ChangeLog is only for the changes in the alias export part. 
  Also, the number of useful disambiguations on SPEC2k has increased 
slightly.

Andrey


2009-04-14  Andrey Belevantsev  <abel@ispras.ru>

         Apply expand from SSA patch.

         * alias-export.c (substituted_in_stmts, stmt_tree_pair, pta_sets,
         pta_sets_key, pta_sets_hash, pta_sets_eq, record_stmt_substitution,
         record_stmt_pta_info, currently_expanding_stmt,
         currently_expanding_tree, find_original_stmt_and_pointer): Remove.
         Remove all uses.
         (rewrite_expr_callback, rewrite_expr_to_ssanames,
         rewrite_mem_callback, rewrite_mem_exprs): Likewise.
         (release_temporary_export_maps, set_current_expand_info): Likewise.
         (find_pta_info): Just take it from SSA_NAME_PTR_INFO.
         * alias-export.h (record_stmt_substitution, record_stmt_pta_info,
         rewrite_mem_exprs, set_current_expand_info,
         release_temporary_export_maps): Remove prototypes.
	* tree-ssa.c (delete_tree_ssa): Do not call release_ssa_name
	when doing alias/ddg export.

2009-04-14  Andrey Belevantsev  <abel@ispras.ru>
         Merge with trunk rev. 146020.


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