more RegSpec constructor validation, fix bug in x86_64 1b reg specs

* the first four 1-byte registers, `al`, `cl`, `dl`, `bl`, can be
  constructed in two ways that produce "identical" `RegSpec` that are..
  not.
  e.g. `RegSpec::al() != Regspec::rb(0)` even though
  `RegSpec::al().name() == RegSpec::rb(0).name()`.

  this corrects the `rb` constructor at least, but instructions like
  `4830c0` and `30c0` still produce incompatible versions of `al`.

* also fix register numbering used explicit qword-sized RegSpec
  constructors, r12 and r13 used to produce r8 and r9

0 files changed, 0 insertions, 0 deletions