[pull] master from ruby:master #249
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If we alias two variable multiple times, for example like this:
alias $foo $bar
alias $foo $bar
Then we will increment the counter for entry2->var->counter each time,
which is not correct because we are not adding more references to
entry2->var. This reports as a memory leak in RUBY_FREE_AT_EXIT because
entry2->var->counter will never reach 0 and thus will never be freed.
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