[cfe-dev] DWARFv5 by default in clang?

[David Blaikie via cfe-dev]

Should we change Clang's default to DWARFv5?

(I'm motivated by having fixed a bug because I only tested with v4 - I
should've tested with v5, but got me thinking about maybe v5 is just a
better default at this point)

Google's been using v5 as the default for the better part of a year at this
point - not the most debugger usage, but we validated GDB and LLDB for v5
pretty well & haven't encountered major issues since the switch.
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