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[dsymutil] Check AttrInfo.Name validity before using it
Summary: This upstreams a patch from the osxcross [1] toolchain. It appears that llvm-dsymutil crashes at this place during GCC bootstrap. Adding the check here seems reasonable, since it operates on arbitrary input DWARF, not necessarily generated by the LLVM toolchain, and it seems the un-mangled name need not necessarily exist. Patch by Thomas Pöchtrager [1] https://github.com/tpoechtrager/osxcross Reviewed By: aprantl Differential Revision: https://reviews.llvm.org/D39336 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@316678 91177308-0d34-0410-b5e6-96231b3b80d8
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