[cfe-dev] Make namespace typo correction always deterministic

[Kaelyn Uhrain]

Without this patch, if there are two different but valid namespace
qualifiers for reaching the same decl, which one was used was determined by
the (undefined) order the namespaces were checked for the identifer. This
patch adds a simple heuristic that keeps whichever version would come first
lexicographically.

Cheers,
Kaelyn
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