Before:

REX.W cmpq r9,r8
setzl r8l
movzxbl r8,r8
REX.W cmpq r8,0x0
jz 185

After:

REX.W cmpq r9,r8
jnz 149

Review URL: https://codereview.chromium.org/1677503002

Cr-Commit-Position: refs/heads/master@{#33784}