[pull] master from ruby:master - #1429
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The separator can be modified in the block yielded by String#each_line.
When that happens, the pointer can change which can cause an use-after-free.
For example, the following script crashes:
sep = "x" * 1_000_000
s = "a#{sep}b#{sep}c"
s.each_line(sep) { sep.clear }
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