Reapply "[MemProf] Add ambigous memprof attribute" (#161717) (#161918) Reapply llvm/llvm-project#157204 with fix and a new test for the issue it caused (the test change provoked the assert that was converted to an if condition). Also, make the application of this new attribute under an (on by default) flag, so that it can be more easily disabled if needed. Add test for the new flag.
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