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Summary: This implements a missing feature to allow importing of aliases, which was previously disabled because alias cannot be available_externally. We instead import an alias as a copy of its aliasee. Some additional work was required in the IndexBitcodeWriter for the distributed build case, to ensure that the aliasee has a value id in the distributed index file (i.e. even when it is not being imported directly). This is a performance win in codes that have many aliases, e.g. C++ applications that have many constructor and destructor aliases. Reviewers: pcc Subscribers: mehdi_amini, inglorion, eraman, llvm-commits Differential Revision: https://reviews.llvm.org/D40747 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@320895 91177308-0d34-0410-b5e6-96231b3b80d8