Ruby

fix flonum hashing regression from r45384

• st.c (st_numhash): mix float value for flonum
• hash.c (rb_any_hash): ditto
• benchmark/bm_hash_aref_flo.rb: new benchmark
• benchmark/bm_hash_ident_flo.rb: ditto
  [Bug #10761]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49376 b2dd03c8-39d4-4d8f-98ff-823fe69b080e