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In some cases, for example when compiling a preprocessed file, the front-end is not able to provide an MD5 checksum for all files. When that happens, omit the MD5 checksums from the final DWARF, because DWARF doesn't have a way to indicate that some but not all files have a checksum. When assembling a .s file, and some but not all .file directives provide an MD5 checksum, issue a warning and don't emit MD5 into the DWARF. Fixes PR37623. Differential Revision: https://reviews.llvm.org/D48135 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334710 91177308-0d34-0410-b5e6-96231b3b80d8