Richard Smith 5fc18a9a1f [modules] Improve performance when there is a local declaration of an entity ...

before the first imported declaration.

We don't need to track all formerly-canonical declarations of an entity; it's sufficient to track those ones for which no other formerly-canonical declaration was imported into the same module. We call those ones "key declarations", and use them as our starting points for collecting redeclarations and performing namespace lookups.

llvm-svn: 241999

2015-07-12 23:43:21 +00:00

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