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Extend FindTypes with CompilerContext to allow filtering by language.

Authored by aprantl on Thu, Aug 22, 2:45 PM.

Description

Extend FindTypes with CompilerContext to allow filtering by language.

This patch is also motivated by the Swift branch and is effectively NFC for the single-TypeSystem llvm.org branch.

In multi-language projects it is extremely common to have, e.g., a
Clang type and a similarly-named rendition of that same type in
another language. When searching for a type It is much cheaper to pass
a set of supported languages to the SymbolFile than having it
materialize every result and then rejecting the materialized types
that have the wrong language.

Differential Revision: https://reviews.llvm.org/D66546

rdar://problem/54471165

This reapplies r369690 with a previously missing constructor for LanguageSet.

llvm-svn: 369710