Apparently this is an expensive operation for certain drivers, even if the
binding doesn't actually change.

When the richedit control is created without the ES_AUTOHSCROLL or the
ES_AUTOVSCROLL, then scrolling isn't done automatically when moving the
cursor with the arrow keys, drag selecting with the mouse, or even from
using the EM_SCROLLCARET (based on testing using a modified version of
wordpad).

wininet: Rename WININET_strdup_AtoW to heap_strdupAtoW and handle NULL argument in its implementation.

This is for SM4 constant buffers, which look like cb<x>[<y>]. At some later
point we should probably translate pre-SM4 constants to constant buffers.

The code removed by this patch was a leftover from the time when we tried to
emulate MOVA with a plain ARL, which only supports one source in plain ARB.
This breaks the more sophisticated MOVA and 4 component ADDR register we have
now however.