Jordan Rose 0f45437104 -build-module-from-parseable-interface: Don't make an extra ASTContext (#25185) ...

This mode is supposed to get all its configuration information from
the switftinterface being read in, but that means that the ASTContext
and ClangImporter that get created by default may not be a sensible
configuration (for example, a mismatched target and SDK, which Clang
emits a warning about). Avoid this by just not creating the ASTContext
if it's already been determined that the frontend is building a module
from a parseable interface.

2019-06-01 15:27:17 -07:00

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