merge revision(s) 49842: [Backport #10933]
* symbol.c (Init_sym): make dsym_fstrs a hash compared by identity as the keys are unique fstrings, to get rid of running hash and compare methods and causing new object allocation during garbage collection phase. [ruby-dev:48891] [Bug #10933]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@50493 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 49842: [Backport #10933]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@50493 b2dd03c8-39d4-4d8f-98ff-823fe69b080e