[06/13] Add free_ptr_hash

[Jeff Law]

On 06/16/2015 02:56 AM, Richard Sandiford wrote:
> Similarly to the last patch, this one adds a free_ptr_hash that inherits
> from both pointer_hash and typed_free_remove.
>
> gcc/
> 	* hash-traits.h (free_ptr_hash): New class.
> 	* dwarf2out.c (decl_table_entry_hasher): Inherit from free_ptr_hash
> 	rather than typed_free_remove.  Remove redudant typedefs.
> 	(external_ref_hasher): Likewise.
> 	* except.c (action_record_hasher, ttypes_filter_hasher): Likewise.
> 	(ehspec_hasher): Likewise.
> 	* ggc-common.c (saving_hasher): Likewise.
> 	* gimplify.c (gimplify_hasher): Likewise.
> 	* haifa-sched.c (delay_i2_hasher): Likewise.
> 	* loop-invariant.c (invariant_expr_hasher): Likewise.
> 	* loop-iv.c (biv_entry_hasher): Likewise.
> 	* loop-unroll.c (iv_split_hasher, var_expand_hasher): Likewise.
> 	* trans-mem.c (tm_mem_map_hasher, tm_memop_hasher): Likewise.
> 	* tree-cfg.c (locus_discrim_hasher): Likewise.
> 	* tree-eh.c (finally_tree_hasher): Likewise.
> 	* tree-into-ssa.c (var_info_hasher): Likewise.
> 	* tree-parloops.c (reduction_hasher, name_to_copy_hasher): Likewise.
> 	* tree-ssa-loop-ivopts.c (iv_inv_expr_hasher): Likewise.
> 	* tree-ssa-phiopt.c (ssa_names_hasher): Likewise.
> 	* tree-ssa-pre.c (expr_pred_trans_d): Likewise.
> 	* tree-ssa-sccvn.c (vn_constant_hasher): Likewise.
> 	* tree-ssa-structalias.c (equiv_class_hasher): Likewise.
> 	(shared_bitmap_hasher): Likewise.
> 	* tree-ssa-threadupdate.c (redirection_data): Likewise.
> 	* tree-vectorizer.h (peel_info_hasher): Likewise.
> 	* tree-vectorizer.c (simduid_to_vf, simd_array_to_simduid): Likewise.
> 	* config/mips/mips.c (mips_lo_sum_offset_hasher): Likewise.
>
> libcc1/
> 	* plugin.cc (decl_addr_hasher): Inherit from free_ptr_hash
> 	rather than typed_free_remove.  Remove redudant typedefs.
Same concern as last patch -- multiple inheritance.  Other than that it 
looks fine.  Will assume you've got the removal of typedefs right in 
cases where you just remove one of value_type vs compare_type.

jeff