[COMMITTED] aarch64 dwarf2 fixes

[Richard Henderson <rth at redhat dot com>]

I've now committed the three patches that I posted 2 weeks ago re aarch64
dwarf2 encoding problems.

Without feedback from ARM, I didn't disable the acceptance of the [bhs]N names
for the vector registers in the context of .cfi_register et al.  I merely
accept all of the vector register names and give them the proper column number.

The actual commit is in three parts, squashed here because I was lazy in
generating the email.


r~

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