[PATCH v4] Add .clang-format

[Tom Tromey]

>>>>> "Andrew" == Andrew Pinski <pinskia@gmail.com> writes:

Andrew> We had a small discussion about this at the cauldron and I think it
Andrew> was agreed that we should include the same across at least GCC,
Andrew> gdb/binutils too.

IIRC gdb and gcc don't really agree on formatting.  Someone who knows
the gcc style well would have to go through all the settings to see.

Tom