Reapply "[MemProf] Reduce cloning overhead by sharing nodes when possible" (#102932) with fixes (#106623) This reverts commit 11aa31f595325d6b2dede3364e4b86d78fffe635, restoring commit 055e4319112282354327af9908091fdb25149e9b, with added fixes for linker unsats. In some cases multiple calls to different targets may end up with the same debug information, and therefore callsite id. We will end up sharing the node between these calls. We don't know which one matches the callees until all nodes are matched with calls, at which point any non-matching calls should be removed from the node. The fix extends the handling in handleCallsitesWithMultipleTargets to do this, and adds tests for various permutations of this situation.
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