David Srbecky d515e94070 Tolerate DWARF compile unit without filename.
Summary:
The DW_AT_name attribute of compile unit is optional.
If it is missing, try to get filename from the debug_line section.
This allows the compile unit to be useful without the filename.

Differential Revision: http://reviews.llvm.org/D11003

llvm-svn: 241679
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