1ae179b325
The backward matching loop in `matchNonCallsiteLocs` was ineffective because `InsertMatching` used `std::unordered_map::insert()` which does not overwrite existing entries. Since forward matching already inserted entries for all non-anchor locations, the backward matching for the second half was silently ignored. The backward matching can update forward mappings in `IRToProfileLocationMap` in 2 ways: - The IR location maps a new different profile location. Change `insert()` to `insert_or_assign()` so that entry overwrite can happen. - The IR location maps the same profile location. Add `erase()` to remove such mapping.
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