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- AMD-only `monitorx`, `mwaitx`, `clzero`, and `rdpru` are now supported
- `swapgs` is invalid in non-64-bit modes
- `rdpkru` and `wrpkru` were incorrectly decoded when modrm bits were not `11`
+* small performance tweaks. read_imm_signed is now inline(always) and some
+ pre-decode initialization is a bit better-packed
## 0.1.4
* [long mode only]: fix decoding of rex-prefixed modrm+sib operands selecting index 0b100 and base 0b101