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Avoid boxing, object[], and string[] allocations in BuildTraceFileName #21752
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This was calling the string.Concat(object[]) overload, which entailed boxing the process ID and allocating an object[]; then string.Concat would allocate a string[] to store the ToString results of all arguments. By calling ToString on the process ID ourselves, we avoid the boxing, the object[], and the string[] (there's a four-string Concat overload).