Implement the first iteration of breakpoints. When a breakpoint is set,
it starts unverified. When a thread begins evaluation, it tries to see
if a breakpoint corresponds to one of the parsed instructions and will
verify it.
Breakpoints work when continue is used.
At the current moment, setting breakpoints while a thread is currently
running doesn't work. Breakpoints are rechecked each time execution is
about to restart.
Signed-off-by: Jonathan A. Sternberg <jonathan.sternberg@docker.com>
Jonathan A. Sternberg
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