[Bug gas/23310] Support DWARF-5 line table features in assembler

[paul_robinson at playstation dot sony.com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23310

--- Comment #4 from Paul Robinson <paul_robinson at playstation dot sony.com> 
---
In addition to the extensions noted in comment 0, of course the .loc 
directive would also need to accept file number 0 if there is one.

My impression had been that file #0 was implicitly the root file as
described in the DW_TAG_compile_unit, but reading the DWARF 4 spec
closely, it does not actually say that file #0 is valid (it is clear
that directory 0 is valid).  So, .loc should accept file number 0
only when the assembler is generating a DWARF-5 line table.

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