Suboptimal zero register should consider flags

[gaul]

Some sequences like the following:

YDIS: cmp byte ptr [rbx+rdx*1-0x1], 0x2f
YDIS: mov ecx, 0x0
YDIS: cmovz eax, ecx

use mov, ecx, 0x0 instead of xor ecx, ecx because the former preserves the flags and the latter does not. Could x86lint do a limited multi-instruction analysis to avoid these false positives?