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Explanation: There were some scenarios where we could call an unsafe function without marking the expression as unsafe. These affect mostly cases where the function's result is passed to another function or returned. This PR makes sure we always flag functions with unsafe return types, even if their result is not stored anywhere for later use. Issues: rdar://157237301 Original PRs: #83520 Risk: Low, worst case scenario the user has to add redundant unsafe keywords in strict memory safe mode. Testing: Added a compiler test. Reviewers: @DougGregor