[Bug libdw/31111] Handle Clang DWARF 5 DW_AT_decl_file 0

[gprocida at google dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31111

--- Comment #4 from gprocida at google dot com ---
The llvm-dwarfdump issues were an unfortunate red herring as I thought I had
found more problems with compilers.

Your comment 1 is exactly what I found. I'm not aware of anything further at
this stage. The LLVM developers did not seem inclined to follow GCC's approach
to the  DWARF 5 standard as written.

I think the workaround suggested in comment 3 makes sense. It makes to check
the behaviour of the various versions of GCC that support DWARF 5 against this,
particularly in regard to __va_list.

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