[sancov] Use comdats when one already exists (#131929) This code avoids adding comdat groups to interposable linkage types (weak, linkonce (non-ODR)) to avoid changing semantics, since comdat elimination happens before weak/strong prevailaing symbol resolution. However, if the function is already in a comdat, we can add to the group without changing the semantics of the linked program. Fixes an issue uncovered in PR #126240
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