Remove tzcnt from audited BMI1 instructions

As it turns out [^1], compilers will emit this instruction in some
circumstances even when BMI1 is not technically available on your
architecture, since by happy-accident older CPU's decode this
instruction in backward-compatible way for non-zero inputs.

[^1]: https://stackoverflow.com/questions/61422827/does-x64-support-imply-bmi1-support

Author: topolarity

src/auditor/instructions.json

@@ -1036,7 +1036,6 @@
         "blsi",
         "blsmsk",
         "blsr",
-        "tzcnt"
     ],
     "adcx": []
 }