Fix ff_emu_edge_core_sse() on Win64.

Fix ff_emu_edge_core_sse() on Win64.

Fix emu_edge_v_extend_15 to be <128 bytes on Win64, by being more strict
on the size of registers and which registers are being used for operations
where multiple are available. This fixes segfaults in emulated_edge()
function calls on Win64.
(cherry picked from commit 17cf7c68ed26a4cb3c7adf7488a38c2e19118918)