Revert "failing tests in multibyte_chars_test.rb fixed". The bug is in Ruby 1.9.1 p376, not in AS test suite.
Revert "failing tests in multibyte_chars_test.rb fixed". The bug is in Ruby 1.9.1 p376, not in AS test suite.

This reverts commit bf1f70d8776e28f9181faefc4914059b4ad26b99.

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