[LTO] Introduce a helper function collectImportStatistics (NFC) (#106179) This patch introduces a helper function collectImportStatistics. The new function computes statistics of imports for ComputeCrossModuleImport and dumpImportListForModule with no functional change. The background is as follows. I'm planning to reduce the memory footprint of ThinLTO indexing by changing ImportMapTy, the data structure used for an import list. The new list will be a hash set of tuples (SourceModule, GUID, ImportType) represented in a space efficient manner. That means that obtaining statistics like the number of definitions per source module requires us to go through the entire import list (for a given destination module). Introducing a helper function now makes the callers more independent of the underlying data structures used in ImportMapT.
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