[RFA] let record_resume fail immediately on error

[Michael Snyder]

Might as well let record_resume call internal_error if it fails,
rather than setting a flag and trying to report on it later.

The flag doesn't really work anyway -- looks like you wanted
record_wait to return SIGABRT (not really the right thing either),
but it doesn't.  Instead we somehow return "no more reverse execution
history".

What do you think, Hui?

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