Guard logging calls to avoid unnecessary work at call site (#2164) #2188
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This is Stephen's PR originally committed into dev7x.
Many LogHelper.Log calls are doing work at the call site, such as allocating params arrays, boxing structs, formatting strings, and so on, even when the data will be thrown away because logging (or logging for that verbosity level) isn't enabled. This adds an IsEnabled method to LogHelper and uses it at any call site where there's such work to be avoided.