perf annotate: Introduce annotated_source__get_line()

It's a helper function to get annotation_line at the given offset
without using the offsets array.  The goal is to get rid of the
offsets array altogether.  It just does the linear search but I
think it's better to save memory as it won't be called in a hot
path.

Signed-off-by: Namhyung Kim <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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