567fe2bbca
This resolves the FIXME in IRSymtab and cleans up the semantics of the IRSymtab. The list of preserved symbols really shouldn't be seen as a property of the IR symbol table, since it's an LTO-specific concern, and it's very tenuous to claim that this information is actually present in the bitcode file to be exposed through its symbol table. Instead, this PR moves this logic into LTO's view of the symbol, which allows consumers to determine preserved-ness themselves. This was broken out of #164916; this prevents that PR from introducing a circular dependency, but it still seems like an independently good idea by virtue of the above.
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