Commit 64f2f910 authored by Rafael Espindola's avatar Rafael Espindola
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Don't crash when llvm.compiler.used becomes empty. 

GlobalOpt simplifies llvm.compiler.used by removing any members that are also
in the more strict llvm.used. Handle the special case where llvm.compiler.used
becomes empty.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186778 91177308-0d34-0410-b5e6-96231b3b80d8
parent c5b8b590
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