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Don't provide the assembler source as the "root file" unless the user asked to have debug info for the assembler source (with -g). If the source doesn't provide an explicit ".file 0" then (a) use the compilation directory as directory #0, and (b) use the file #1 info for file #0 also. Differential Revision: https://reviews.llvm.org/D48055 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334512 91177308-0d34-0410-b5e6-96231b3b80d8