[PATCH] D57659: [Sema] SequenceChecker: Add some comments + related small NFCs in preparation of the following patches

[Bruno Ricci via Phabricator via cfe-commits]

riccibruno created this revision.
riccibruno added reviewers: aaron.ballman, rsmith.
riccibruno added a project: clang.
Herald added a subscriber: cfe-commits.

Do the following NFCs, before doing anything more substantial:

1. Add some comments to hopefully reduce the amount of code staring for the next guy.
2. Pack `UsageInfo` by storing the using expressions and sequencing regions separately. There is no point in wasting space here.


Repository:
  rC Clang

https://reviews.llvm.org/D57659

Files:
  lib/Sema/SemaChecking.cpp

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