[sil-printer] Refactor out printing of silvalue use lists into its own function and do some small cleanups. NFC.
[sil-printer] Refactor out printing of silvalue use lists into its own function and do some small cleanups. NFC.

khizkhiz/swift,khizkhiz/swift,khizkhiz/swift,khizkhiz/swift,khizkhiz/swift,khizkhiz/swift,khizkhiz/swift