* PStore content update perf optimization. Patch by Masaki Matsushita.

  See #5248.

* lib/pstore.rb (save_data):

  * Delete inadequate Marshal check.

  * Deferred file truncation: when writing the new content, truncate
    the saved file to the data size after writing the data, instead of
    truncating whole bytes before writing data.

  * Deferred MD5 calculation: when comparing MD5 hash to check the
    content modification, calculate MD5 hash of new data iif the
    content length is differ from the old one.

  * Compare content size with String#bytesize instead of String#size.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@34083 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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