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Crash in xf86CrtcRotate with Option "Rotate" in xorg.conf.d

After upgrading from 1.20.6 to 1.20.7 on Arch Linux, Xorg segfaults at startup when the following line is in my xorg.conf monitor config:

Option "Rotate" "left"

With the line commented out, Xorg starts normally (and the monitor can be rotated later using xrandr without crashing).

Attached is a GDB log including a full backtrace; it seems likely that commit 094f42cd is the cause (though I have not bisected). The pScreen being passed to xf86RotateRedisplay still has NULL for pScreen->root, and eventually &pScreen->root->drawable is dereferenced, causing a segmentation fault.

GDB log including full backtrace

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