[Bug 246630] stable/11 regression: base.txz reproducibility depends on number of cpu cores

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246630

--- Comment #8 from Conrad Meyer <cem at freebsd.org> ---
First code-size change is shortly afterwards:

│ -  43c83e:    45 31 c0                xor    %r8d,%r8d
│ -  43c841:    44 8a 3b                mov    (%rbx),%r15b

│ +  43c83e:    45 31 db                xor    %r11d,%r11d
│ +  43c841:    8a 0b                   mov    (%rbx),%cl

%cl (low 8 bits of %ecx) has a shorter mov.b representation than %r15b (low 8
bits of amd64 %r15).

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