tools: add performance-log-coalesce.py; use in performance-log-viewer
Add a new performance-log-coalesce.py tool, which groups together performance-log address-map entries belonging to the same function into a single symbol, by filling-in missing base symbol addresses. The addresses are grouped such that each set of addresses corresponding to a symbol of the same name, in the same source file, are given the same (unique, but arbitrary) base address. See the previous commit for why this is necessary. This should work fine in most cases, however, for logs produced on Windows, it can over-coalesce addresses belonging to different C++ lambda-functions in the same source file, since they all seem to be given the same _FUN symbol name. Use the new tool as part of the pipeline in performance-log-viewer.
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