st.c: use power-of-two sizes to avoid slow modulo ops
st.c (hash_pos): use bitwise AND to avoid slow modulo op
(new_size): power-of-two sizes for hash_pos change
(st_numhash): adjust for common keys due to lack of prime modulo
[Feature #9425]
hash.c (rb_any_hash): right shift for symbols
benchmark/bm_hash_aref_miss.rb: added to show improvement
benchmark/bm_hash_aref_sym_long.rb: ditto
benchmark/bm_hash_aref_str.rb: ditto
benchmark/bm_hash_aref_sym.rb: ditto
benchmark/bm_hash_ident_num.rb: added to prevent regression
st.c: use power-of-two sizes to avoid slow modulo ops
(new_size): power-of-two sizes for hash_pos change
(st_numhash): adjust for common keys due to lack of prime modulo
[Feature #9425]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45384 b2dd03c8-39d4-4d8f-98ff-823fe69b080e