[clang][analyzer] Record entry-point CFG size in per-entry-point metrics (#163351) MaxCFGSize does not make sense in the context of per-entry-point metric. Moreover, it gets polluted by the syntax-only checks that run before path-sensitive analysis: the first entry point analized by path-sensitive analysis will have MaxCFGSize set to the max CFG across all syntax-only-analyzed entry points, which has little meaning. This change unbundles the per-TU statistic MaxCFGSize and per-EP statistic CFGSize. -- CPP-7099
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