[debugger] account for inlined functions when stepping.
- Remove obsolete BreakLocatorType. - Perform PrepareStepOnThrow after OnException event, in case stepping was scheduled in the exception event. - Use frame count instead of frame pointer for stepping. Frame pointer is not reliable due to possible deopts. - Consistently check for inlined functions in inlined frames. - Use SharedFunctionInfo in FloodWithOneshot and EnsureDebugInfo. R=jgruber@chromium.org BUG=v8:5901 Review-Url: https://codereview.chromium.org/2664793002 Cr-Commit-Position: refs/heads/master@{#42878}
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