Jordan Rose 63731584b6 [serialization] Introduce ModuleID, with codes for special modules. ...

ModuleID is compatible with IdentifierID, but uses 0 to mean “the builtin module”
and 1 to mean “the current module”. Anything else is a top-level module name,
as an identifier. As an implementation detail, 1 is now never a valid IdentifierID.
(0 remains “the empty string”.)

Using this, simplify the encoding of the owner of a conformance.

Swift SVN r9944

2013-11-04 23:50:46 +00:00

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