swift234

[CodeComplete] Avoid the assertions of already-type-checked ASTs.

Constraint generator likes the input AST to be not type-checked yet. However,
in code completion, we usually feed CSGen a (at least partially)
type-checked AST to infer the types of unresolved members, which
may lead to assertion failures. So we override the asserted method in
the code completion part to avoid explosions.

Swift SVN r32732