[Bug gas/27280] md5 DWARF v5 additions require -gdwarf-5

[maskray at google dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27280

--- Comment #1 from Fangrui Song <maskray at google dot com> ---
The idea of .file 0 auto-upgrade is that the compiler should emit .file 0
before .file 1, so the assembler does not need to deal with DWARF v5 md5
syntax.

I compiled a top-of-tree GCC. It emits `.file 1` instead of `.file 0`. So what
is current GCC's support for version 5 .debug_line? You can see that `clang
-gdwarf-5 -S` emits `.file 0`.

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