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|  | * 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 | 
|  | these functions had a copypaste error where the r12 and r13 versions
would create RegSpec for registers 8 and 9 instead of 12 and 13. use
correct register numbers in these macros. | 
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|  | right now... | 
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|  | This reverts commit 15c821a2d3fbf2fc0458090b6cc12f2ac093f075. | 
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|  | not a huge improvement, but something | 
|  | these instructions ignored rex bits even for xmm reigsters, which is
incorrect (so says xed) | 
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|  | vex/rex prefix cleanup, finally profitable to inline read_0f*_opcode | 
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