Fixes: https://bugs.llvm.org/show_bug.cgi?id=37168
This is only a first pass at supporting these custom import
modules. In the long run we most likely want to treat these
kinds of symbols very differently. For example, it should not
be possible to resolve such as symbol at static link type.
Differential Revision: https://reviews.llvm.org/D45796
llvm-svn: 352828
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