[MachineOutliner][NFC] Make Candidates own their call information
Before this, TCI contained all the call information for each Candidate.
This moves that information onto the Candidates. As a result, each Candidate
can now supply how it ought to be called. Thus, Candidates will be able to,
say, call the same function in cheaper ways when possible. This also removes
that information from TCI, since it's no longer used there.
A follow-up patch for the AArch64 outliner will demonstrate this.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@337840
91177308-0d34-0410-b5e6-
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