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Summary: `perf2bolt` accepts executable name, and the tool will find all the PIDs associated with that executable. When different versions of an executable are running at the same time, name alone may not be sufficient as we will get samples from different versions of the binary aggregated together. The resulting fdata may look stale to BOLT, which makes BOLT bailout optimization for functions. This change adds a `-pid` switch that lets user specify process ID in addition to executable name so BOLT can target a specific process. (cherry picked from FBD17178898)
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