openssl/digest.rb: get rid of deprecated class

* ext/openssl/lib/openssl/digest.rb (digest, hexdigest): create
  new instance and call on it directly, to get rid of deprecated
  class OpenSSL::Digest::Digest.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44115 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
openssl/digest.rb: check by lambda

* ext/openssl/lib/openssl/digest.rb (initialize): check argument
  size by lambda.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44116 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
gc.c: ruby_sized_xrealloc2

* gc.c (ruby_sized_xrealloc2): reallocate from old size.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44117 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
gc.c: use st_update

* gc.c (wmap_aset): use st_update instead of st_lookup and
  st_insert.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44118 b2dd03c8-39d4-4d8f-98ff-823fe69b080e